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Charlie said:I have an on line friend who is obsessed with this light stuff and he has been communicating with Ray Peat and he said some of the orange would be good for other kinds of hormone activation.
narouz said:Thanks!
I wonder if Peat a believes that at least a little bit of ultraviolet is needed for Vitamin D production?
Isn't it one of the ultraviolets that stimulates D?
. When you double the voltage, you quadruplicate the consumed power (watts) by the bulb; meaning you'll burn it in less than a second. You need one designed for the same power that operates at your voltage. And I'm sorry there, I don't live in Europe to help.John Eels said:I also don't understand how voltage (v) and the watt (w) influence efficacy. Watt is cumulative and the higher the number the greater the effect. Holds this true for voltage, too? I live in Europe and we run our electrical gear on 220V. Does it pay-off to invest in a voltage converter?
jaa said:Are these bulbs good for light therapy?
http://www.lowes.ca/light-bulbs/sylvani ... 02064.html
I plan on using to of those bulbs with the bayco clamp light - http://www.amazon.com/gp/product/B0061M ... B0061MZ4Q6
I also have one extra clamp light. Are there any other bulb types I should get?
Cheers
jaa said:Thanks Charlie and narouz. I'll check out that other thread.
Assuming peat meant the 130V, is there much difference between the wavelengths emitted by that and the 120V? Or is it just splitting hairs?
I think the slightly shorter wavelengths are the most beneficial, from about 600 nm to about 850 nm. -Dr. Peat
[peatarian] I asked Ray Peat again about the right bulbs, here is his answer:
[Peat]"Plain incandescent bulbs are o.k., but the best kind are used by farmers for incubators, etc., and are designed as 130 volt bulbs, so when they operate on 120 volts they have a bias toward the longer wave red color, and they have an internal reflector. They are often called "infrared" or "heat lamps," but they have a clear glass front."
You still get the normal bulbs on Ebay and some companies are working on re-introducing them as 'heat bulbs'.
http://heelspurs.com/a/led/BLACK.gif ""When you consider that halogen is between the sun and incandescent, and
then look at my chart below, then you can see halogen is the best.
Likewise, if you consider that heat lamps are shifted further to the
right, then you can see they are not even as good as incandescent, let
alone halogen. You can't even see red of most heat lamps, which shows
they provide zero from 600 to 700 nm. Even 800 nm would glow red.
"Yes, Scott, that sure would seem to be true--based on your chart.
Can you imagine a significant shift in an infrared bulbs wavelengths
caused by running a 130V (infrared) bulb at 120V...?"
"That makes it even cooler than normal which means more far infrared that
only heats the skin."
By running at 120 V a 130 V
bulb, he is simply saying how they create a "heat lamp". They simply use
an incandescent filament but make the wire a little longer as if house
voltage was 130 V. It would look like an incandescent if house voltage
was 130 V. But since house voltage is 120V it does not get as hot and
bright as usually, and everything shifts towards the "red" or 'infrared'
(same direction). This is still to the right of the incandescent spectrum
in my chart which shows it is not as good as an incandescent for healing
wavelengths. It gets the water in the skin too hot too soon.
"That makes it even cooler than normal which means more far infrared that
only heats the skin."
You can't even see red of most heat lamps, which shows
they provide zero from 600 to 700 nm. Even 800 nm would glow red.
narouz said:But looking back over this now,
I spot what seems to be a break in Scott's reasoning.
Scott said (above)about the 130V heatlamp bulb run at 120V:
"That makes it even cooler than normal which means more far infrared that
only heats the skin."
If the 130V heat lamp bulb running at 120V is cooler than normal,
then wouldn't that shift its radiation to the left
away from the infrard spectrums
and back toward the visible red spectrum of roughly 600-700nm,
back toward the Peat desirable 600-850nm wavelengths?
gabriel79 said:narouz said:But looking back over this now,
I spot what seems to be a break in Scott's reasoning.
Scott said (above)about the 130V heatlamp bulb run at 120V:
"That makes it even cooler than normal which means more far infrared that
only heats the skin."
If the 130V heat lamp bulb running at 120V is cooler than normal,
then wouldn't that shift its radiation to the left
away from the infrard spectrums
and back toward the visible red spectrum of roughly 600-700nm,
back toward the Peat desirable 600-850nm wavelengths?
Hi, Sorry I can't expand the explanation writing in my phone. The above is incorrect. When the filament gets cooler by operating at a lower voltage, the light emitted spectrum shifts to the right, towards longer wavelenths. The higher the temperature, more shift to the shorter wavelengths.
Ray Peat wrote:
"Incandescent bulbs have a continuous spectrum, luminous gases have intermittently distributed wavelengths. Orange and red are the metabolically most important wavelengths. I don't think the far infrared does anything special, besides heat. Ordinary incandescent bulbs have a slightly orange color compared to sunlight, and the bulbs I have mentioned are just slightly warmer in color, with very little blue, and more red. Ordinary incandescent bulbs are good, if there are enough of them, directed toward your skin."
The light from an incandescent light bulb is produced by a solid metal filament of Tungsten wire through which an electric current is passed. The current heats the filament to an extremely high temperature (typically 2000 to 3000 K) producing a thermal blackbody spectrum with a peak intensity in the near infrared (1000 - 1500 nm). Although the peak is not in the visible region, there is still enough energy emitted at visible wavelengths to produce light useful to the eye (although this light is much "yellower" than the white light of the Sun which has a temperature of about 5800 K).
http://zeiss-campus.magnet.fsu.edu/articles/lightsources/tungstenhalogen.htmlA significant portion of the electrical power consumed by incandescent tungsten wire filaments is output in the form of electromagnetic radiation spanning the wavelength region between 200 and 3000 nanometers. Mathematically, the total radiation increases as the fourth power of the wire temperature, which shifts the spectral distribution to increasingly shorter (visible) wavelengths in a bell-shaped profile as the temperature is increased (see Figures 1 and 3). Even though the peak wavelengths tend to be redistributed from the near-infrared closer to the visible region with higher filament temperatures, the melting point of tungsten does not permit the majority of output radiation to shift into the visible spectral region. At the highest practical operating temperatures, the peak emission is centered at approximately 850 nanometers with about 20 percent of the total output being visible light. Infrared wavelengths, which comprise most of the output, must be dissipated as unwanted heat. As a result, compared to the daylight spectrum (5000+ K) emitted by mercury, xenon, and metal halide arc lamps, the red portions of the spectrum always predominate in tungsten-halide lamps.