Quote Originally Posted by DreadedHermie
About time. Got 6 reds and 2 blues epoxied down and lighting up.

Here's the voltages they want in order to draw 1.2A each:

Reds
1 10.6
2 10.9 (10.6V gives 1.1A)
3 10.6
4 10.6
5 10.6
6 10.8 (10.6V gives 1.1A)

Blues
1 14.7
2 15.2 (14.7V gives 1.0A)


So, I can balance 'em out with resistors, or not. I can run all the reds
at 10.6 and have the 2 stiff ones running just a tad cooler @ 1.1A.

Best, for heat and efficiency!

I can run 3 of the 10.6's together on the PLN 60-12, and get another 60-12 to drive the other 3 @ 10.8V, with a resistor to protect the lone 10.6V in that string. Or, if the 60-12 would handle it, I could run all 4 of the 10.6V reds together, but then I'm still looking for a driver for the 2 remaining reds. Not so sure "pushing" the 60-12 gets me anywhere in terms of matching the drivers up with the leds. Weezard, whatcha think?

Not worth the trouble.
Once you hit 1 amp you have a working light.
Hotter emitters yield less light.
1.1 amps will use 12 Watts.
You also have 152 mv. of ripple to deal with so I'd run them a little cool.

For the blues, I can put a resistor on the 14.7V led and run 'em @ 15.1V. Since I may have overkill on the blues anyway, I could also just run at 14.7V and let the 15.1V blue cruise along a 1.0A. When I run the pair at 14.7V they look the same to me: too bright to look at. :smokin:

That's right.
You have twice as much blue as you need.
And will prolly be dimming them anyway so I'd run 'em both at 14.7 to keep the heatsink .

Back in a minute with resistor calcs. Don't tell me the answer! :detective1:
Calc away. It's good practice.

Well done!
Weeze