Heat Lamps Don't Offer Clinically-Proven Wavelengths of Light
Heat lamps are designed to induce heat stress on a user. The heat is the point. The problem is that excess heat can potentially cause damage to your skin. By contrast, high-quality LED light therapy devices give off very little heat, and have been found safe, effective, and free of side effects in numerous clinical trials.
Even if heat lamps could deliver clinical results similar to light therapy, the burn risks aren’t worth it. Beyond the heat dangers, heat lamps simply don’t offer the clinically-proven wavelengths or medical-grade power output of a high-quality LED device.
What are the ideal wavelengths for light therapy?
Red wavelengths (600-660 nanometers) and
near Infrared wavelengths (810-880 nm). These narrow ranges fall within the “therapeutic window”, a term used by photomedicine researchers to describe the band of wavelengths that have the greatest positive effect on cellular biology. Other wavelengths have limited effectiveness, at best.
Less than 1% of the energy from heat lamps is delivered from 600-660 nm, and only about 2% is delivered in the entire 810-880 nm range. In total, these wavelengths only represent about 3% of the total energy delivered by a heat lamp bulb. In other words, 97% of wavelengths from a heat lamp fall outside of the wavelength range known to produce the greatest health benefits.
Heat lamps produce a wide range of wavelengths, but as the graph below shows, the wavelength curve builds to its peak output around 1100 nm.
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Translation: heat lamps deliver mostly ineffective wavelengths of light that don’t have any real effect on human health.
In addition to heat lamps delivering inferior wavelengths, they don’t offer medical-grade power like a high quality LED light therapy device.
A robust amount of research has shown that the total energy delivered to the body typically needs to be 4-5 Joules/cm2 at a minimum to produce skin benefits. Some clinical studies have even shown that higher amounts, approaching 100 Joules, are needed to treat deep tissue.
The total power output—sometimes referred to as irradiance—from a device also directly impacts the time required for treatments. Lower-powered products like heat lamps take way longer to produce benefits, if ever. Imagine filling up your water bottle from a dripping faucet—it will fill up eventually, but you’ll waste a lot of time in the process. You can read more about how to accurately measure light therapy power here.
That’s another problem with IR heat lamps: the light power that’s delivered drops off a great deal as you move further away from the light—even though they get hot enough to burn you, which obviously isn’t good!
Heat lamps are a double-edged sword: too close and you can burn yourself. Too far, and you don’t get any real power.
The graph below shows the irradiance of four 250-watt infrared heat lamps. Because they’re hot to the touch, you need to be at least 18” away, but at that distance, the irradiance is only about 1 mW/cm2. With this type of power, you’re going to need hours to receive a meaningful dose of energy. Who has that much time every day?
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There’s a reason you can pick up IR heat bulbs at your local hardware store for less than $10. They simply can’t deliver the clinical benefits of a real
red light therapy device, and they come with too many risks.
There are many studies on this.