I would think a good 92mm fan, mounted to the fins and firing through a 6" dryer duct to the outside would cool that thang. But, much I don't know about the setup. "

And that was my plan, with a 150mm. fan.
But from 2 1/2 inches above the fins, even with reflectix routing, it was inadequate.
Had to flip it over to run the burn-in safely.

Now that "Reddy Kilowatt" is through larking about, I'm ready to try to do it right and port the heat outside.
I can afford to allow some escape of fragrance 'cause my neighbor is growing 30 plants outdoors.

"I won't have a chance to work on a light for a few weeks, but the window on acquiring parts may be closing soon. "

Not for the blues. And a mix of 660nm. and 625 nm. just might be a good thing.

"How was the 4:1 ratio in your cakepanlamp?"

There was a little stretching of the top buds.
Happened after the pre-flower stretch of the stem.
Started to look like this;
[attachment=o216777]
Then in the last 2 weeks, did this;
[attachment=o216776]

"When I read "My next lamp will have 2 blues" I took that to mean you were looking for a bluer ratio than 4:1. But I'm thinking an 8:2 light might suit me for flower. Have you determined if 10:2 is overkill with the reds? (As the French say; "One never knows what is 'enough' until one knows what is 'too much.'") (Naturally, they say that in French...)"

Mais Weeze mon frere.

That's the plan.
However, 8:2, 10:2, etc.
Are just numbers without a ton of details.
Blue leds are less efficient than reds, different bins = different characteristics within a color, etc.

To get a true ratio, we have to use KNNA numbers.

Since I'm unsure what is best, right from the git, I'm unwilling to make that kine effort.
If I ever descend into "micromole land," I may not return.
Math is seductive, it can own you.
At the least, very little practical magic would get done.:i feel stupid:

I changed the plan from a dimmer on the blue, to two dimmers for the reds.
Then did an overkill on the number of reds.
I know that 30W of blue will do a great veg .with little or no stretch. So I can add red with the dimmers to try to find the ideal ratio for vegging.
Then I can add more red to the ratio for blooming to look for the best ratio there.
I only ran the reds flat-out for the smoke test/burn-in.
But, if it turns out to need full-on red, it's still got to run cool.
That's why I'm STILL waiting for fans to arrive before I chop any more holes in floor and ceilings.

Havin' fun though,
Weeze