Near-Infrared 250W Incandescent Heat Lamps: The Best Value Red Light Therapy.
Are 250W Incandescent Heat Lamps the best "Value" Red Light Therapy device?
Yes, in many ways.
A recent article from Glen Jeffery showed that simple 60W incandescent lighting at a workplace can improve eye health. And these effects lasted longer than his previous trials with 670nm LED light therapy that only lasted 5 days. [1]
Professor Jeffery also cautions against excessive power and intensity from LED panels. However, he indicates that incandescent bulbs can be used more safely and for longer exposure times without adverse reactions.
According to top RLT influencers' review criteria, Incandescent 250W Red-Coated Heat Lamps are easily at the top of the ranking for the best Red Light Therapy.
Consider the common review criteria:
- High Power for Low Cost (high value)
- Many NIR wavelengths for every possible benefit of PBM
- Distance Treatments ~18-48 inches away effective
- Pleasantly Warm heating
- Great coverage area with ability to expand "modules" for more coverage
- Low Flicker and Low EMF
Despite checking all these boxes, influencers contradict their own criteria by contriving excuses and nuances against them. NIR Heat Lamps don't emit the right wavelengths, they don't deliver the correct dose, and they deliver unacceptable heating. Like most of the products influencers label as "junk" in the industry, we know that the real problem with incandescent heat lamps is that they don't offer fruitful affiliate sales commissions.
More importantly, recent research shows the biological importance of wavelengths >1100nm, whereas previously it was assumed those longer wavelengths would only be useful for heating. We find that the peak emission at 1275nm corresponds to emerging clinical research around this beneficial wavelength range for deep penetration, brain applications, and pain.
This is where incandescent bulbs are not only an affordable option for RLT, but output effective intensity in a biologically crucial spectrum that LEDs currently struggle to emit.
Optical Wattage Output:
We sent a 250W Incandescent heat lamp to a 3rd party lab that can measure wavelengths up to 1700nm.
For reference, we sent the GE brand bulb from Walmart. Any of our previously tested 250W lamps would have a very similar power output and spectrum. In other words, please don't ask me to get more brands of incandescent heat lamps 3rd party tested, since this testing costs about $1,000 per bulb.
The lab measured 50 Watts of Total Optical Power output in the range of 600nm to 1700nm. This is an impressive amount of optical power from such a simple, cheap device.
Note that there may be significantly more power >1700nm being emitted, meaning the total power output will be even greater than 50 Watts. If we fit Plank's Law equation to finish the graph, then we could estimate the rest of the spectrum.
Here can extrapolate another 24 Watts of optical power output longer than 1700nm. Totaling at over 74 Watts of power based on my math.
"Value" = Cost Per Watt Output:
Let us say it costs about 30 dollars total for the bulb ($12) and a lamp ($18).
That equates to $30 / 50W = 0.60 $/W. So, it only costs 60 cents per Optical Watt for the "value" of a heat lamp. Really good.
In contrast, a LED panel emitting 50W of optical power may cost anywhere from $100 to $300. So that would be a range of value of 2 to 6 $/Watt.
- 250W Heat Lamp - 0.6 $/W value
- LED Panel - 2-6 $/W value
It is quite clear that the 250W incandescent heat lamp delivers significantly more value when using the mainstream comparison technique of "value". And if we add in the calculated power with longer wavelengths, then the value calculation gets even better.
Getting 3-6 of these bulbs for full-body coverage would only cost up to $180. They can be organized and mounted on a shoe rack or shelf. Create a tent or enclosure out of Mylar or drop cloths and you have a DIY NIR Sauna.
Intensity and Distance:
We had the 3rd party lab also take intensity measurements from several distances from the incandescent lamp. This was measured directly from the center-point of the lamp.
| Distance |
Intensity (mW/cm^2) (600-1700nm range) |
| 12 inch | 65 |
| 18 inch | 31 |
| 24 inch | 17.8 |
| 36 inch | 7.5 |
| 48 inch | 3 |
The intensity does drop off significantly with distance, as this is a single bulb without a narrow focus. However, this can be a good thing to control your exposure within a reasonable range of distances.
Remember that 65mW/cm^2 from an incandescent heat lamp will feel very different than 65mW/cm^2 from a typical LED panel. As well, there is likely significantly more intensity from wavelengths longer than 1700nm that could not be measured with the lab's equipment.
The intensity from the longer wavelengths (>1400nm) will be more superficially absorbed by water in the skin and be felt as heat.
Whereas wavelengths that penetrate deeper from LED Panels (700-1100nm) will have more volume in the skin to disperse and thermoregulate.
For that reason. the typical recommendation for 250W incandescent heat lamps is to be at least 18 inches away. Which still nets a hefty 31 mW/cm^2.
Starting at even 36-48 inches away can be pleasantly warm. And you can comfortably achieve 20 minutes of exposure time for a therapeutic effect.
Using the device greater than 48 inches away (>4 feet) can be quite safe and used as an indoor supplement for near-infrared light and some general indoor heating. Note that we do not recommend leaving these types of lamps on unsupervised in the rare case that they could overheat or break.
Coverage Area at 24 Inches Away:
Covering a wide area is a key point with many large LED panels. So we had the 3rd party lab create a coverage map of the incandescent heat lamp at the 24 inches away distance.
The majority of the intensity is delivered within a 10'' diameter circle at 24 inches distance. This is an excellent amount of area to cover for a single bulb.
These bulbs are easily "modular", by simply buying more bulbs and lamps. One popular DIY setup is to clamp them onto a shoe rack, or stand them up on any type of shelf or rack.
Breakdown of Popular Wavelengths:
LED Panels can emit targeted wavelengths that have been studied to be therapeutic and deeply penetrating, typically in the range of 600nm to 1100nm. With focus on clinically studied narrow wavelength ranges like 630nm, 660nm, 810nm. 830nm, 850nm, 1064nm, etc.
There is fear that the spectrum of a 250W Heat Lamp is inadequate. It only delivers a small percentage of it's wavelengths in the 600nm to 1100nm range. In fact, LED brands and influencers often make a more narrow band to make incandescent heat lamps sound bad like 600-900nm or even cutting out the 700nm range.
However, based on recent research the beneficial effects can be gotten from less than 5mW/cm^2 of intensity from these therapeutic wavelengths. And Professor Jeffery's study has shown that incandescent bulbs performed better than 670nm LED. [1]
Seeing the exact breakdown of intensity at 24 inches away can give us confidence that we are getting therapeutic intensity from these highly studied wavelength ranges. As well, just 10-20 minutes can get a therapeutic benefit.
Again, we can also extrapolate this spectrum with Plank's Law to complete it.
From the calculation, there is an additional 15mW/cm^2 that extends past 1700nm. This is substantial radiant energy of over 32mW/cm^2 at 24 inches away.
Dosing Calculations:
Although most RLT influencers struggle to understand "dosing" for LED Panels because they are poorly studied, they suddenly take great issue with NIR Heat Lamps being improperly dosed.
For Total Joules, we take the 50 Watts total optical output and multiply it by exposure time. For 10-20 minutes, that will make it 30,000 to 60,000 Joules.
Even if we account for 60% skin reflection losses then that drops to 12,000 to 24,000 Joules. Which is still a hefty dose compared to Total Joules dosing standards.
At 24 inches away, we are getting 17.8mW/cm^2, which is a respectable intensity.
With just 10-20 minutes of exposure you get 11 J/cm^2 to 21 J/cm^2. Again we can cut that in half for skin reflection losses. But still an excellent dose for Red Light Therapy and Heat Therapy combined that can be safely used daily without fear of biphasic dose response.
Real Skin Penetration Window is 600-1400nm:
Can the wavelengths from an incandescent heat lamp penetrate the skin? Yes, in the research of Water-Filtered IRA, they show a skin penetration range of 600nm-1400nm through living humans. [2]
So we already know that if we want the benefits of wavelengths penetrating deeply into the skin, then we need some of those longer wavelengths up to 1400nm.
We had the 3rd party lab conduct an experiment where they tested the penetration though their lab technician's hand.
This is actual 3rd party test data through a hand with the GE 250W heat lamp at 24 inches away. Confirming that an incandescent heat lamps also gets the same penetration as any other types of devices such as Laser or LEDs. Since the penetration is dependent mostly on wavelength, this was not surprising.
The standout for this experiment is that 805nm had the deepest penetration, followed by 1085nm. Wavelengths in the currently trending 1050nm, 1064nm, and 1070nm range suffer by being dragged down by a water absorption peak at 971nm.
That is why the optimal tradeoff between water absorption and lower scattering appears around 1080nm. Shorter wavelengths 1050-1070nm seem to suffer from less penetration as they are too close to a water absorption peak at 971nm.
[https://omlc.org/spectra/water/abs/index.html]
And we also confirmed what was already reported by the wIRA studies, that the "optical window" of the skin ranges from 600nm to 1400nm. This means the intensity of the deeply penetrating range from a heat lamp covers a much wider range.
At 24 inches away, there is 12 mW/cm^2 of intensity that deeply penetrates the skin. That is 68% of the total 17.8mW/cm^2 total intensity in the range that was measured.
LEDs currently struggle to emit wavelengths >1000nm, and the ones that do emit around 1050-1072nm are often expensive and inefficient. It is incandescent bulbs that can deliver these wavelengths in this crucial penetration window at an affordable cost.
Thus, a good strategy would be to have an affordable and efficient LED panel with the standard wavelengths in the 600's and 800's, and then get your longer wavelengths from incandescent or sunlight.
Useless Sunlight Spectrum?
It is often implied that wavelengths longer than 1100nm are essentially useless for biology other than for heat.
It was claimed that longer wavelengths (>1100nm) do not penetrate deeply due to water absorption in the skin, and thus converted into heat that is not as biologically interesting as the photochemical effects from Photobiomodulation.
Sunlight spectrum emits about 17% of its intensity in the range >1100nm. We cannot ignore the possibility that these wavelengths have unique biological effects beyond heating.
Gerald Pollak's research has shown that longer wavelength Infrared light was optimal to produce Exclusion Zone (EZ) water in the cells. [3]
The studies that show Infrared protects the skin from Ultraviolet Light in a SPF-15-like protection used Philips 250W heat lamps. [4]
More recently, researchers like Scott Zimmerman, Bob Fosbury, and Glen Jeffery are now all appreciating that longer wavelengths can be quite beneficial for human health.
In recent interviews, they often reference that photons with 0.6 to 1 eV of energy are essential for a cascade of biological and metabolic processes. That equates to the 1200nm to 2000nm wavelength range. Which is a perfect range for incandescent bulbs to emit affordably.
Scott Zimmerman's paper revealed a game-changing finding that intracellular melatonin production was a key mechanism for Near-Infrared light therapy. The intracellular melatonin does not make you sleepy, but it used as a powerful antioxidant inside the cell. [5]
However, one of the key references used for this discovery was using an incandescent heat lamp, not LED or LASER as the commercial industry would want you to assume.
The paper clearly states:
"In piglets, exposure to red-infrared heat lamp (597–780 nm) significantly increased their salivary melatonin level compared to exposure to heat lamp without NIR irradiation (ceramic lamp) [157]." [5]
Indeed, the study that Scott referenced confirms that they used a 175 Watt red-coated incandescent lamp to measure this melatonin response:
"Exposure to red heat lamps, rather than ceramic lamps, resulted in the strongest circadian rhythm of salivary melatonin in piglets." [6]
When compared to a standard heating pad or ceramic heaters, the incandescent NIR lamp produced superior melatonin synthesis. Proving that it is the wavelengths, not just heat, that causes the melatonin production.
"Heat lamps are used more widely in the commercial swine industry than heated mats or floors but are a less energy efficient thermal aid [10]. The latter results indicate not the heat, but rather the NIR influenced melatonin synthesis." [7]
Thus, we can appreciate that it is Incandescent Heat Lamps that produce this benefit of intracellular melatonin production for the antioxidant Photobiomodulation effects.
1275nm Is the Next Hype Wavelength:
For example, in the near future there will be hype around 1275nm as a deeply penetrating wavelength with tremendous benefits and applications in Photobiomodulation.
Why haven't consumers heard about 1275nm wavelength yet? Because there are no commercial LED products to sell with affiliate commissions for this wavelength yet. The influencers writing books and blogs only "educate" consumers about science that funnels them to a profitable product.
Here are a few recent Photobiomodulation articles that have shown the benefits in the 1200nm range.
According to a recent October 2025 study, they chose 1275nm as the wavelength due to the superior penetration over 808nm or 1070nm. This showed effectiveness in treating neurodegenerative diseases in mice.
"In this study, we utilized 1275-nm light due to its well-known ability to penetrate deeper into the brain compared to the light at 660, 808, and 1070 nm (Genina et al. 2019; Kashiwagi et al. 2023). " [8]
One study showed that 1275nm penetrated over 2x through muscle tissue compared to 808nm:
"For the testing group with 2-mm porcine muscle block, the transmittance ratio of 1275 nm laser was 2.2-fold of that of 808 nm laser." [9]
A study on rodents showed that 1270nm penetrated deeper into rodent skulls than 1060nm or 808nm. And this showed promising results for applications for stroke treatments. [10]
Another 2025 review article explains the unique mechanisms gotten by 1267nm, that has tremendous potential for treating the brain.
"Notably, the use of NIR-II (1000-1700 nm) is emerging as a promising therapeutic tool, offering deep tissue penetration, reduced scattering, and minimal tissue absorption 128."
...
"Additionally, 1267 nm PBM (32 J/cm2) has shown promise in enhancing meningeal lymphatic drainage, clearing β-amyloid from the brain, and improving cerebral oxygen saturation in mice, representing a potential therapeutic strategy for AD by supporting lymphatic function 131." [11]
A 2019 study notes that 1270nm is uniquely targeting oxygen as it's chromophore. And this mechanism explains the antioxidant, anti-inflammatory, and cellular proliferation effects.
"The laser wavelengths within 1265-1270 nm corresponds to the maximum oxygen absorption band." [12]
Thus, without using 1275nm wavelength, consumers are missing out on this crucial mechanism and many benefits that could have been gotten from Photobiomodulation. Benefits that most consumers can only get from sunlight or incandescent bulbs.
Another 2024 study confirms improved Nitric Oxide and blood flow in the 1000-1700nm range, similar to the reported mechanisms of conventional PBM in the 600-900nm range.
"Since NIR light in the NIR-II window (1000-1700 nm) with the largest penetration depth into tissues compared to NIR I has also been reported to augment NO bioavailability and cerebral blood flow ameliorating stroke injury, PBM using NIR-II light may be suitable for therapeutic use." [13]
Another study makes it quite clear on the penetration and benefits of 1000-1700nm that are superior to the typical 630nm-1000nm range. Also confirming the same Nitric Oxide mechanism as the conventional PBM range.
"In addition to NIR light in the NIR-I window (630–1000 nm), studies have also looked into the stimulative effects of light in the NIR-II window (1000–1700 nm) on NO release, which boasts less scattering and greater penetration depth. In a recent study, exposure to low-power light at two distinct wavelengths (1064 and 1270 nm) was found to be significantly associated with increased NO in ECs (Figure 3(E)), highlighting the potential of NIR-II window light to improve CBF. 40" [14]
Another 2023 article reviews the Nitric Oxide mechanisms of PBM and had this to say about 1270nm:
"Recently, we have demonstrated that two distinct wavelengths of low-power NIR-II laser (1064 and 1270 nm) induce NO release [80], suggesting that the effect of tPBM is mediated not only by the direct effect of NIR-II light on oxygen metabolism in neuronal cells but also improved blood flow via augmented NO generation in endothelial cells." [15]
According to a 2020 study, the 1275nm wavelength was medically approved for several areas of pain, fibromyalgia, and physical therapy. So why haven't consumers been educated about such an important therapeutic wavelength?
"More importantly, laser with 1275 nm wavelength has been approved by the Food and Drug Administration (FDA) to be applied for physical therapy. It produces long-lasting beneficial effects for the treatment of chronic pain and fibromyalgia [22, 23]." [16]
A Feb 2024 review article confirms the novel prospect of using 1267nm for transcranial PBM for the brain. They review the recent studies on it's efficacy and comment on it's potential for superior penetration.
"Therefore, the development of innovative strategies to deliver light deeper, including, for example, modern lasers (e.g., 1267 nm) with deep penetration into brain tissues, will open a new era in tPBM for treatment of brain diseases." [17]
Incandescent heat lamps deliver this deeply penetrating wavelength 1200nm range in a cheap and affordable form. This is a great prospect to support brain health, pain, and activate crucial PBM mechanisms missing from most LED panels.
Pleasantly Warm or Too Much Heat?
As the name implies, Incandescent NIR Heat Lamps do provide heating to the skin or surfaces that are affected by the light.
The top RLT influencers and brands have insisted that heat is a good thing for Red Light Therapy. However, they often contradict this claim to disparage heat lamps.
Suddenly, heat is a bad thing for RLT when delivered by an incandescent bulb. Only the heat from influencers' affiliate LED Panels is acceptable.
Regardless of using LEDs, Lasers, or Incandescent as a light source - it may be important to monitor your skin temperature during treatments. This can be done with a simple non-contact skin thermometer.
Thus, a scientific approach would be to test and monitor the skin temperature rise from exposure to a heat lamp at the recommended distance. Here, I tested my stomach with the GE Heat Lamp at 24 inches away.
Even after 40 minutes the maximum skin temperature was 40.6C (105F). Which is an ideal temperature for heat therapy. Note that your individual results may vary depending on ambient room temperature, air flow, skin color, skin thickness, and thermoregulation.
You can see the skin temperature plateaued after 25 minutes, this is because the skin increases blood flow and thermoregulation to reach a steady-state. In other words, heating does not always increase infinitely, the skin temperature finds a new equilibrium when under constant heating.
In studies using longer wavelengths, they acknowledge that some small amount of heat is acceptable, although it is otherwise rare to feel heat with conventional PBM.
"While a small amount of heat may be produced during PBM, this temperature increase stays within a safe range and does not lead to significant tissue damage." [14]
For safety: as is recommended in the clinical research of Water-Filtered IRA, if the temperature reaches an excessive threshold (>41C), or otherwise feels uncomfortable to the user - then they recommend to increase the distance away from the lamp.
Or, as we have recommended for years with excessively powerful LED panels, to use a cooling fan on the skin over the area being treated.
Ironically, we see more anecdotes of people reporting burns and erythema (skin redness, sunburn-type effects) from high powered LED panels, and less reports from actual incandescent heat lamps. As usual, the influencers need to project their own problems onto competing products.
Eyes and Skin Safety
When using an incandescent heat lamp directly aimed at the face, then it is advisable to use safety glasses or goggles. The Shade-5 safety glasses can be gotten from Amazon do an excellent job at significantly blocking Infrared down to negligible levels.
Aiming the incandescent heat lamp at the forehead can be quite beneficial for brain health. As noted earlier, the longer wavelengths around 1080nm and 1275nm can penetrate quite deeply and benefit the brain. Thus, during that treatment we would recommend wearing the safety glasses.
One study notes that in direct sunlight, skin temperature rises to an average of 40C. Which is the limit we found with our experiment at 24 inches away.
"In direct sunlight, the temperature of human skin rises to about 40 degrees C following the conversion of absorbed IR into heat." [18]
Thus, it is no surprise that our skin can easily tolerate temperatures up to 40C with minimal risks.
When skin temperature is above 39C for long periods of time is when there is a multiplier for ROS production that can lead to biphasic dose response or negative effects.
"When the skin temperature exceeds 39 °C, IR radiation-induced heat shock ROS are additionally produced in the skin, thus multiplying the action of solar IR radiation-induced ROS." [19]
So, just monitoring skin temperature and being mindful to stay below 41C will be key to skin safety when using an incandescent heat lamp on the face or head. Ideally around 39-40 C is the maximum range if you are being cautious.
Flicker From Incandescent Heat Lamps
All lighting connected to the Alternating Current (AC) power grid is subject to flicker.
The broad definition of Flicker is the temporal modulation of brightness or optical intensity.
Often, discourse on Flicker focuses on the Frequency, measured in Hertz (Hz). Hertz is a general scientific unit describing how often something cycles "per second". So if something is flickering or pulsing at 60 Hz, that just means it is cycling 60 times per second.
For most standard lighting, the Frequency is twice the AC cycle. So in the USA (60 Hz) and other parts of the world (50 Hz), the Flicker Frequency will be 120 Hz (USA) or 100 Hz (everywhere else).
In other words, the Frequency (Hz) is often the constant, and not the biggest issue. It is the magnitude of the flicker that must be considered.
Flicker does not always mean the lamp or device turns Off or On by 100% each cycle. This was an issue with first generation LEDs that lacked circuitry in the drivers to smooth out the waveform. Modern, high quality LED devices can actually have lower flicker than incandescent now due to the technology being used to drive them.
Most flicker is a modulation of brightness or intensity that does not dip down to zero. One important measure of this is the Flicker Percentage (%), that calculates the relative magnitude of these dips in brightness and/or intensity.
The incandescent filaments heat and cool due to the cycles of power in the Alternating Current (AC). However, the mass of the filament retains most of the heat. So, they do not have time to fully cool, and thus they do not dim by a significant percentage. Often causing people to falsely assume that incandescent bulbs do not flicker at all.
High Powered Incandescent bulbs like 250W benefit the most from this, since they likely use larger, thicker coils for filaments. A standard 60W bulb may flicker at 9 to 15 %, but it is known that higher powered incandescent bulbs have even less flicker.
The 3rd party tested flicker waveform shows only 1.7% flicker. This is impressively low, that competes with even the best modern LED drivers. The flicker frequency is a predictable 120Hz, since it was tested on the USA grid.
We can comfortably conclude that incandescent heat lamps do not exhibit any significant flicker worth noting. Again, this will be true of any brand or bulb in the 250W incandescent heat lamp category.
EMFs Mitigation of Incandescent Heat Lamps
Electromagnetic Fields (EMFs) are generated whenever there is electronic circuitry. This is taught as basic physics to nearly all engineering disciplines. Thus, any electronic device that claims to be "no EMF" is either being misleading or ignorant because they missed their first semester college-level physics.
Incandescent bulbs are a simple technology. Power is driven across the filament, and there are no other electronics or circuitry required to support it.
Whereas LEDs and Fluorescents required power adapters, drivers, or ballasts to modify the AC power to transform it into a voltage and current that is better suited to the new technology. The act of modifying the electricity often creates inadvertent magnetic fields, radio frequency fields, and dirty electricity.
Thus, incandescent bulbs naturally avoid much of the EMF problems caused by modern lighting. However, there is often still an Electric Field EMF from the AC grid through the incandescent lamp. The "no EMF" incandescent bulb manufacturers often include grounding and shielding technology in their lamps that will easily eliminate the electric fields.
We can simulate this as a "hack" by using an ESD (ElectroStatic Discharge) kit that plugs into ground and connecting the alligator clip to any part of metal on the lamp. Just a simple grounding clip on the reflector cuts the EMF by half.
Additional shielding can include putting a metal (no coating or paint) chicken-wire or fence mesh over the front of the bulb connected to the lamp. This also protects from accidentally touching the bulb and getting a burn, and the mesh can catch the glass if the bulb shatters.
Conclusions:
Incandescent Near-Infrared Red-Coated 250W Incandescent Heat Lamps are easily the best value Red Light Therapy. When using the top RLT influencers' review criteria for LED Panels - when fairly assessed - the NIR Heat Lamps will end up on top by a wide margin.
As usual, the contradictory nature show that influencers prioritize fruitful affiliate sales commissions over their own made-up criteria. They demonstrate that they don't care about delivering high value, deep penetrating wavelengths, or the latest science. They only "care" when they have a relevant product to sell.
NIR Heat Lamps are cheap, emit high power, emit adequate intensity over a wide area, and cover a broad spectrum of Near Infrared wavelengths for every potential benefit of Photobiomodulation. In addition, properly applied heat therapy has tremendous benefits.
We recommend everyone to at least try an incandescent heat lamp for Red Light Therapy as part of their journey into light therapies. It has the potential to supplant even the top-rated LED devices, or at the very least offer a supplement of a broad spectrum Near-Infrared emitter to eliminate the Fear-Of-Missing-Out (FOMO) of trendy wavelengths and marketing.
NIR Heat Lamps are often safer than LED panels. After being mindful of overheating and the glass shattering - the light therapy itself is much safer. The spectrum is broader, so it is less likely to overdose on a concentrated wavelength like being delivered by LED. Longer wavelengths have lower eV and less likely to trigger a biphasic dose response. And incandescent lamps are more natural with a broader spectrum like sunlight that our biology is likely more accustomed to.
We found that NIR Heat Lamps offer wavelengths, mechanisms, and penetration beyond what can be offered by conventional LED Panels. Particularly in the ranges above 1000nm, and you can get ahead of the hype around 1275nm that is proving to be an important wavelength for deep penetration, brain treatments, and pain.
Like most of the science we present, there is nothing sensational about this technology. Incandescent heat lamps are an old, cheap technology. The intensity is low according to the fake standards set by influencer books that used Solar Power Meter measurements. The spectrum is broad with no single wavelength to isolate as spectacular. Real science is simple, mundane, boring, and safe.
Incandescent heat lamps don't need fancy books or YouTube videos spamming marketing narratives for them. They are sitting humbly at your local hardware or farm supply store for you to drive down the road to pick them up.
References:
[1]
Barrett, E.M., Jeffery, G. LED lighting (350-650nm) undermines human visual performance unless supplemented by wider spectra (400-1500nm+) like daylight. Sci Rep 16, 3061 (2026). https://doi.org/10.1038/s41598-026-35389-6
[2]
Piazena H, Müller W, Vaupel P. Physical and Photobiological Basics of wIRA-Hyperthermia. 2022 May 6. In: Vaupel P, editor. Water-filtered Infrared A (wIRA) Irradiation: From Research to Clinical Settings [Internet]. Cham (CH): Springer; 2022. Chapter 3. Available from: https://www.ncbi.nlm.nih.gov/books/NBK593478/ doi: 10.1007/978-3-030-92880-3_3
[3]
Hamblin MR. Molecular and Cellular Mechanisms of Water-Filtered IR. 2022 May 6. In: Vaupel P, editor. Water-filtered Infrared A (wIRA) Irradiation: From Research to Clinical Settings [Internet]. Cham (CH): Springer; 2022. Chapter 23. Available from: https://www.ncbi.nlm.nih.gov/books/NBK593483/ doi: 10.1007/978-3-030-92880-3_23
[4]
Barolet D, Christiaens F, Hamblin MR. Infrared and skin: Friend or foe. J Photochem Photobiol B. 2016 Feb;155:78-85. doi: 10.1016/j.jphotobiol.2015.12.014. Epub 2015 Dec 21. PMID: 26745730; PMCID: PMC4745411.
[5]
Tan DX, Reiter RJ, Zimmerman S, Hardeland R. Melatonin: Both a Messenger of Darkness and a Participant in the Cellular Actions of Non-Visible Solar Radiation of Near Infrared Light. Biology (Basel). 2023 Jan 6;12(1):89. doi: 10.3390/biology12010089. PMID: 36671781; PMCID: PMC9855654.
[6]
Liu K, Liu L, Tai M, Ding Q, Yao W, Shen M. Light from heat lamps affects sow behaviour and piglet salivary melatonin levels. Animal. 2022 Jun;16(6):100534. doi: 10.1016/j.animal.2022.100534. Epub 2022 May 10. PMID: 35561486.
[7]
Zhu Y, Li Y, Reese M, Buchanan E, Tallaksen J, Johnston L. Behavior and Performance of Suckling Piglets Provided Three Supplemental Heat Sources. Animals (Basel). 2020 Jul 7;10(7):1155. doi: 10.3390/ani10071155. PMID: 32645987; PMCID: PMC7401536.
[8]
Volume 24, Issue 12 e70261
RESEARCH ARTICLE
Open Access
1275-nm Photobiomodulation Alleviates Brain Drainage Impairment as a Promising Therapeutic Strategy for Aging-Related Neurological Decline
Hao Lin, Shaojun Liu, Qihang Yang, Junming Li, Jue Wang, Oxana Semyachkina-Glushkovskaya, Dongyu Li, Tingting Yu, Dan Zhu
First published: 15 October 2025
https://doi.org/10.1111/acel.70261
[9]
Wu X, Suo Y, Shi H, Liu R, Wu F, Wang T, Ma L, Liu H, Cheng Z. Deep-Tissue Photothermal Therapy Using Laser Illumination at NIR-IIa Window. Nanomicro Lett. 2020 Jan 24;12(1):38. doi: 10.1007/s40820-020-0378-6. PMID: 34138257; PMCID: PMC7770864.
[10]
Originally Published 4 April 2024
Near-Infrared II Photobiomodulation Preconditioning Ameliorates Stroke Injury via Phosphorylation of eNOS
Shinya Yokomizo, PhD https://orcid.org/0000-0003-4096-9695, Timo Kopp, MSc https://orcid.org/0000-0003-2852-0019, Malte Roessing, MSc, Atsuyo Morita, MD, Seeun Lee, PhD https://orcid.org/0000-0001-8525-9430, Suin Cho, MD, PhD https://orcid.org/0000-0001-8507-1382, Emiyu Ogawa, PhD, … Show All … , and Dmitriy N. Atochin, MD, PhD https://orcid.org/0000-0002-2405-2070 datochin@mgh.harvard.eduAuthor Info & Affiliations
Stroke
https://doi.org/10.1161/STROKEAHA.123.045358
[11]
Wang L, Mao L, Huang Z, Switzer JA, Hess DC, Zhang Q. Photobiomodulation: shining a light on depression. Theranostics. 2025 Jan 1;15(2):362-383. doi: 10.7150/thno.104502. PMID: 39744683; PMCID: PMC11671386.
[12]
Dolgova D, Abakumova T, Gening T, Poludnyakova L, Zolotovskii I, Stoliarov D, Fotiadi A, Khokhlova A, Rafailov E, Sokolovski S. Anti-inflammatory and cell proliferative effect of the 1270 nm laser irradiation on the BALB/c nude mouse model involves activation of the cell antioxidant system. Biomed Opt Express. 2019 Jul 31;10(8):4261-4275. doi: 10.1364/BOE.10.004261. PMID: 31453009; PMCID: PMC6701526.
[13]
Kashiwagi S, Yokomizo S, Bragin DE, Perle SJ, Kastanenka KV, Gerashchenko D, Atochin DN. Therapeutic Potentials of Near-Infrared II Photobiomodulation to Treat Cerebrovascular Diseases via Nitric Oxide Signalling. Adv Exp Med Biol. 2024;1463:195-200. doi: 10.1007/978-3-031-67458-7_33. PMID: 39400823; PMCID: PMC11670881.
[14]
Yan B, Zhou J, Yan F, Gao M, Tang J, Huang L, Luo Y. Unlocking the potential of photobiomodulation therapy for brain neurovascular coupling: The biological effects and medical applications. J Cereb Blood Flow Metab. 2025 May;45(5):800-830. doi: 10.1177/0271678X241311695. Epub 2025 Jan 7. PMID: 39763390; PMCID: PMC11705326.
[15]
Satoshi Kashiwagi, Atsuyo Morita, Shinya Yokomizo, Emiyu Ogawa, Eri Komai, Paul L. Huang, Denis E. Bragin, Dmitriy N. Atochin,
Photobiomodulation and nitric oxide signaling,
Nitric Oxide,
Volume 130,
2023,
Pages 58-68,
ISSN 1089-8603,
https://doi.org/10.1016/j.niox.2022.11.005.
(https://www.sciencedirect.com/science/article/pii/S1089860322001240)
[16]
Wu X, Suo Y, Shi H, Liu R, Wu F, Wang T, Ma L, Liu H, Cheng Z. Deep-Tissue Photothermal Therapy Using Laser Illumination at NIR-IIa Window. Nanomicro Lett. 2020 Jan 24;12(1):38. doi: 10.1007/s40820-020-0378-6. PMID: 34138257; PMCID: PMC7770864.
[17]
Hao Lin, Dongyu Li, Jingtan Zhu, Shaojun Liu, Jingting Li, Tingting Yu, Valery V. Tuchin, Oxana V. Semyachkina-Glushkovskaya, and Dan Zhu "Transcranial photobiomodulation for brain diseases: review of animal and human studies including mechanisms and emerging trends," Neurophotonics 11(1), 010601 (5 February 2024). https://doi.org/10.1117/1.NPh.11.1.010601
[18]
Cho S, Shin MH, Kim YK, Seo JE, Lee YM, Park CH, Chung JH. Effects of infrared radiation and heat on human skin aging in vivo. J Investig Dermatol Symp Proc. 2009 Aug;14(1):15-9. doi: 10.1038/jidsymp.2009.7. PMID: 19675547.
[19]
Darvin, M.E., Meinke, M.C., Lademann, J. (2017). Radical Production by Infrared Irradiation in Human Skin. In: Humbert, P., Fanian, F., Maibach, H., Agache, P. (eds) Agache's Measuring the Skin. Springer, Cham. https://doi.org/10.1007/978-3-319-32383-1_136