Re: Introduction to LED Lighting Recording Is Up!


Great comments from Terri and questions from Rick. Rick, you are correct in deducing that the UV emissions are completely absorbed both by the phosphor powders and by the phosphor array enclosure and collimating lens, which are organic epoxide/acrylic. Additional protection comes from additional driver architecture. UV emitting diodes used in industry and security have to overcome their architecture to emit any long-wave UV. Note that there are no short wave UV LED’s. There have always been IR emitting LED’s, which is where the technology started, and these used in touch-screen technology, today. With the advent of new diode electron receptor materials, possible emission wavelengths got shorter and shorter. But because current is still flowing and because there is resistance to moving electrons across the anode of the diode, 15 watts of heat (infra-red) is still 15 watts of heat and that heat has to be dissipated somewhere – hence all the heat-sinks and fins in an effort to get it away from the phosphors. Using more expensive heat-stable phosphors is the option higher-priced lamps use. My guess is that most successful manufacturers will shift in this direction over the next 5-years.