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Old 10 January 2013, 13:49   #21
Country: Finland
Town: Helsinki
Boat name: SR 5.4
Make: Avon
Length: 4m +
Engine: Toh1 3,5 Yam 90/2S
Join Date: Oct 2009
Posts: 896
Thanks, here also usefull information:

LED driving and controlling methods

Yes, they get hot very quickly without heat/termal sink.

This seams to be a versaltile pice, voltage in/out and current is adjustable, and price delivered
about 3 euros. But again no idea about the quality....Instructions in totally not understandable chinglish..will order a few to test.
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fun on a boat is inversely proportional to size...sort of anyway
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Old 11 January 2013, 07:51   #22
Country: UK - Wales
Town: Here
Boat name: doggypaddle
Make: Avon 5.4 Searider
Length: 5m +
Engine: yamaha 80
Join Date: Jul 2007
Posts: 1,107
Originally Posted by nik View Post
If you have a soldering iron, this seems a cheap solution.

Super simple high power LED driver

Thats the best simple way to do it, a simple current sink from a 317 chip.
a resistor will work but as battery voltages varies from 10.8 to 15 volts (worst case) you wont have a very stable light output.
just look at the Vf/Current for an LED, they are more or less a voltage reference, therefor must be driven by a constant current. a resistor is a very bad way of doing this . (unless you have a very big resistor and high voltage battery!!

I am usually not as green as i am cabbage looking.
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