3 ms·
Blackbody radiators and millions of years of evolution are hard to beat. I like the energy efficiency of CFL and LED but I do not like the spectral power distri
by cmurf 10y ago
Blackbody radiators and millions of years of evolution are hard to beat. I like the energy efficiency of CFL and LED but I do not like the spectral power distribution or the decay rate and ensuing hue shift of these light sources.
And it's not something only experts notice. If you have multiple bulbs in the same proximity, one fails, whether replaced under warranty or you just buy a new one with identical color temperature specs, it'll look different from the others.
Recapturing heat loss from incandescent to make them more efficient, maybe even on the order of today's LEDs seems more promising to me than arresting decay rates and/or the hue shift problems.
- twic 10y ago> heat loss from incandescent to make them more efficient, maybe even on the order of today's LEDs seems more promising to me This is already happening - you can apply a 'hot mirror' coating to reflect infra-red radiation back into the bulb, while allowing visible light out. This is a very old idea - here's a patent from the early 1960s which states that the basic principle was already in use: http://www.google.com/patents/US3174067 http://www.google.com/patents/US3174067 And another which applied it specifically to coating a halogen incandescent light bulb: http://www.google.com/patents/US3209188 http://www.google.com/patents/US3209188 Here's a report / puff piece from 2013 asserting that this technology is currently taking off and claiming that "by 2018 the efficiency of a hybrid halogen incandescent light bulb will exceed that of the current compact fluorescent lamps (CFL) and equal light-emitting diodes (LEDs) on the market by 2023": http://www.smithmillermoore.com/Pdfs/technicalarticles/3-6-13_DSI_LTB_The_Rebirth_of_theIncandescentLightBulb.pdf http://www.smithmillermoore.com/Pdfs/technicalarticles/3-6-1...