The server just got overloaded, or so it claimed, and ate my post! Gotta start saving work as I go, maybe.
Anyway, the first heatsink is all drilled and tapped. Ordered (4) 92mm fans.

I like the 6 n 2 setup.
Me, too! 6 it is!

You can go from 3:1 R:B to 6:1 with the flip of a switch.
I need some help here. If I just switch a blue LED out of the circuit won't the driver attempt to deliver the current (that was split between the blues) to the single blue?

If it stays under 40 degrees C. you don't really need a fan.
Between 40 and 50 C. in the first hour?
Add a thermal switch in series with the fan to conserve power.
Over 50 degrees in a the first hour of burnin?
Hardwire both fans
Thank you so much. I needed that info badly. Is there a way to get an accurate enough reading without buying an IR thermometer? And, do you have a part# or description of the thermal switch I might need?

Thought of another possible layout. [attachment=o213685] Thoughts? LED's should be here Thursday! Thanks for all your help. This is fun! :thumbsup:
DreadedHermie Reviewed by DreadedHermie on . Calling out to Weezard for LED advice My friend, I've read your stuff here and at Steve F.'s site. I want to build a dedicated flowering lamp using Ledengin 15 watters. (4 reds, 1 blue, and possibly 1 warm white; LM 317's so I can tweak the ratios.) Essentially, a copy of your 4+1 cake pan lamp but built on a 4 x 18" finned heatsink so I can see what's going on under it.) If I were to post my picks for power supply, resistor ratings / values, etc., would you critique and perhaps offer some guidance? I have already purchased Rating: 5