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Re:A photon-recycling incandescent lighting device by zubiaur on Friday April 14, 2023 @07:03PM (#35575980)
This seems similar to HIR technology, widely available on car headlamps:

“The HIR1 (9011) and HIR2 (9012) Halogen Infrared Reflective bulbs have micro-thin layers of electro-deposited coating on a specially-designed bulb. The coating reflects the filament's infrared (heat) back onto the filament, which results in a hotter filament that produces more light without increased power consumption, shorter bulb life, or extra heat production.“

Re:A photon-recycling incandescent lighting device by adrian_b on Friday April 14, 2023 @07:11PM (#35576034)
The principle is the same, but here a much more sophisticated implementation is shown, which is able to achieve better performances than the LED lamps.