On Wed, 4 Jul 2001 00:00:50 -0400 Brandon Fosdick writes: > > The Feb 2001 issue of Scientific American has an article that > answers your > question. Unfortunately its not accessible from their web site. The > short answer > is that its a cost/consumer acceptance problem. Its not yet cheap > enough to > compete with conventional lighting in the home market, but its > making headway in > commercial and utility applications, namely traffic lights. The > article also > says that only 10% of the traffic lights in the US are LED based. > In the past couple months, pretty much all the traffic lights here have been changed to LED. I kinda wonder what the electronics to run an LED on 120VAC looks like. I'd expect some sort of boost switcher acting as a constant current source into a bunch of LEDs in series. Not really very simple or cheap. In an effort to save electricity, you certainly don't want to just use a big current limit resistor! Harold ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: http://dl.www.juno.com/get/tagj. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads