Will White LEDs Dethrone the Incandescent Bulb?
These original Kirt's Cogitations™ may be reproduced (no more than
5, please) provided proper credit is given to me, Kirt Blattenberger.
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Cog·i·ta·tion [koj-i-tey'-shun] – noun: Concerted thought or
reflection; meditation; contemplation.
Kirt [kert] – proper noun: RF Cafe webmaster.
White LEDs are now available,
thanks to progress in Gallium Nitride (GaN) and Indium GaN (InGaN). One versions combines a blue LED with a yellow
phosphor to generate white light (slightly yellowish). Another uses a UV LED to excite red, blue and green
phosphor (ala a fluorescent lamp) to get white light. Efficiencies of 20 lumens/watt have been demonstrated -
which is better than an incandescent bulb. Someday in the not-too-distant future you will likely see them in
Wal-Mart where the 100-year-old-technology bulbs sit today.