Bike Forums - View Single Post - Those LED-based headlights?

10-17-04 | 09:47 PM

#85

bkrownd

kipuka explorer

Joined: Apr 2004

Posts: 3,297

Likes: 2

From: Hilo Town, East Hawai'i

Bikes: 1994 Trek 820, 2004 Fuji Absolute, 2005 Jamis Nova, 1977 Schwinn Scrambler 36/36

Quote:

Originally Posted by slvoid

Please, my rear LED soaks up nearly a watt. Fraction of a watt, are you sure you're not confusing the cateye front light with a cheap 1 LED blinker?

A 1 Watt luxeon uses about 0.35 amp, and it gets HOT. (I have held one in my hand while its running) The small LED's in the EL200 would MELT if they tried to pass even that much current. How many LEDs are in your rear light?

OK, I just looked up the datasheet for a superbright white LED on a supplier website - the brightest they had. The maximum current rating is 0.03 Amp, and the maximum power rating is 0.12 Watt. This particular LED has a typical forward voltage drop of 3.5 V (max 4.0V), similar to a Luxeon. The maximum power rating for a headlight like the EL200 made with 3 of these would be 0.36 Watt. Using the "typical" operating spec (3.4V, 0.02Amp) you would get 0.2 Watt.

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Last edited by bkrownd; 10-17-04 at 11:02 PM.

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