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Just want the folks on this forum to know that a great engineering resource is the Lumileds road show. For the agenda, check out: http://www.lumileds.com/newsandevents/LUXTECHSEM.PDF
The one-day agenda covers electrical, thermal, and optical characteristics of the luxeon family. It seems to be a cross-training seminar, so as not to spook professionals who are naive in electrical, thermal, and/or optical fields. (I learned a whole lot about chroma relationships.)
The support was excellent -- a half-dozen Lumileds engineers/marketing specialists for a small room of students -- and the token entry fee ($250) included great lab instrumentation and a give-away experimentation kit of three leds and power supplies.
The presentation was engineering-frank, not marketing hype: Yeah, three-dimensional binning (lumens, voltage-forward, nM hue) results in some losers, and you don't get to reject the losers when you buy (we knew this). Yeah, when you plan for thermal mangement, don't bother to include the power sent out as light -- just multilpy V-in by I-in and calculate how much heatsink you need to keep the LED junction tempature under 120C. ('Course, if you're building a flashlight, you probably don't want your hand-held flashlight body hitting, say, 100C, or whatever ungodly number that is in Fahrenheit.)
There's some great new product bouncing recently from San Jose (chip fab) to Malaysa (assembly) in a few months: higher efficiency side-emmiters, hi-dome, constant-phospher white emitters, and the most-engimatic 5W die.
At the semimar, they showed a 5w luxeon flashlight -- for a few minutes.
I own a ARC-LS and a Surefire E2. They both get hot running full-out. I think a 5W Luxeon need auxilary cooling. Let's think on this. I suggest thermal-derating.
The one-day agenda covers electrical, thermal, and optical characteristics of the luxeon family. It seems to be a cross-training seminar, so as not to spook professionals who are naive in electrical, thermal, and/or optical fields. (I learned a whole lot about chroma relationships.)
The support was excellent -- a half-dozen Lumileds engineers/marketing specialists for a small room of students -- and the token entry fee ($250) included great lab instrumentation and a give-away experimentation kit of three leds and power supplies.
The presentation was engineering-frank, not marketing hype: Yeah, three-dimensional binning (lumens, voltage-forward, nM hue) results in some losers, and you don't get to reject the losers when you buy (we knew this). Yeah, when you plan for thermal mangement, don't bother to include the power sent out as light -- just multilpy V-in by I-in and calculate how much heatsink you need to keep the LED junction tempature under 120C. ('Course, if you're building a flashlight, you probably don't want your hand-held flashlight body hitting, say, 100C, or whatever ungodly number that is in Fahrenheit.)
There's some great new product bouncing recently from San Jose (chip fab) to Malaysa (assembly) in a few months: higher efficiency side-emmiters, hi-dome, constant-phospher white emitters, and the most-engimatic 5W die.
At the semimar, they showed a 5w luxeon flashlight -- for a few minutes.
I own a ARC-LS and a Surefire E2. They both get hot running full-out. I think a 5W Luxeon need auxilary cooling. Let's think on this. I suggest thermal-derating.
