10 watt 400 lumen star

[2000xlt]

did i miss this?

http://cgi.ebay.com/1-Star-Bright-1...2566311QQihZ012QQcategoryZ66954QQcmdZViewItem

 

[mmmflashlights]

DealExtreme listed some similar high power LEDs a week or two ago. Unless you need 1 emitter, you'd get better efficiency putting 3 Rebels, Crees, etc. together.

 

[OddOne]

I cooked up a PC board design for six Rebels on a 0.85" dia. double-sided board with a TON of vias and the whole backside as a heatplate for thermal transfer, if that counts for anything. (I have a feeler thread over in the marketplace about having a bunch made.) With 100lm Rebels it'll do a good thousand lumens if you can overdrive the LEDs without cooking them, and 0.85" would fit into a great many places.

oO

 

[matrixshaman]

Those are quite interesting considering the voltage is 13.5 to 14 volts. This would seem to lend itself very well to running in automotive applications. Typical voltage in a 12 volt system when running is usually close to 13.5 volts when the alternator is charging.

 

[OddOne]

Those are quite interesting considering the voltage is 13.5 to 14 volts. This would seem to lend itself very well to running in automotive applications. Typical voltage in a 12 volt system when running is usually close to 13.5 volts when the alternator is charging.

I'd still use a regulator for LEDs in automotive applications though, as auto electrical systems are VERY noisy. Loads of spikes up in the 50-70 volt range thanks to the back-EM from ignition coils. This is why if you've ever seen the inside of a car's ECM (Electronic Control Module, or engine computer) you'll always find at least one, and usually several, MOVs and other voltage transient suppressors, along with suppressor capacitors galore.

Thankfully, a 12-volt regulator works marvelously on car electrics since the charge voltage is 13-14VDC. Just gotta make sure the reg can handle 100-volt spikes safely, and that's fairly straightforward to do.

oO