RE: Breaking the myth: Incandescent bulbs don't last
January 15, 2016 at 11:28 am
(This post was last modified: January 15, 2016 at 11:35 am by Anomalocaris.)
Yes, but reducing the voltage reduces the watts consumed, which reduces the temperature of the same filament radiating surface, which shifts the emission further to the infrared, which means it puts out even lower light to heat ratio.
Incidentally, there is a recent report of the successful proving of concept of a super incandescent bulb which promise to put out 40% of its total power draw in visible light. Such a bulb would be much more efficient than even LEDs.
The basic idea is this bulb wraps the filament in a nanotech manufactured shell that reflects IR but is transparent to visible light. Only visible light gets through the shell. Most IR is reflected back to the filament, where it is re-absorbed and the re-radiated at a slightly higher average frequency, thus extracting a few visible light photons from pure IR photons. The shell itself is much larger than the filament, remains cool, and radiates comparatively little IR to the outside.
Incidentally, there is a recent report of the successful proving of concept of a super incandescent bulb which promise to put out 40% of its total power draw in visible light. Such a bulb would be much more efficient than even LEDs.
The basic idea is this bulb wraps the filament in a nanotech manufactured shell that reflects IR but is transparent to visible light. Only visible light gets through the shell. Most IR is reflected back to the filament, where it is re-absorbed and the re-radiated at a slightly higher average frequency, thus extracting a few visible light photons from pure IR photons. The shell itself is much larger than the filament, remains cool, and radiates comparatively little IR to the outside.
