Quote Originally Posted by solarman
â??heatsing & lm317's Think the heatsrink â?? woops very heavy sesh last night!:wtf:


I have just ordered 2 red 2 blue 10w ledâ??s to compensate spectrum will I need a separate power supply ,I have a 15v laptop power supply ?

Cheers!
I went over the spec sheet.
Was surprised to find errors.
They seem to have transposed the min. and typ. ratings on at least one chart. tsk!
You'd think they'd hire a spec sheet editor.
Nothing critical.

Your problem will be the LM317
Max current for the 317 series is 1.5 A.!

You can use a pass transistor with the 317, or just write it off and get a higher current voltage rectifier like the LM375.
You'll want 1.8- 1.9 A for full output.

The amber led's Vf is typ. between 10 and 11 volts so a 15V supply would do.
On the blue emitter the min. voltage is 16V. the cc supply needs about 2v. of "headroom" so a 19V. supply would be my minimum for that.
Each star will still need it's own regulator because of the high current draw.
I see you are still posting as I type.

"Doh! Iv ordered 7v 10w "

Huh? Sorry, to be so dense, but what are you saying here?

Might wanna slow down a bit, brah.
Haste makes waste.
Aloha,
Weezard