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Those units are top of the line' flowering' lights. For veg you can use a lot less horse power, even fluorescents.

Seems that one will do 4-5 3070s with a nice efficiency

Just germinate some Green House seeds, wow what a difference! Popped and in soil in 4 days.

FINALLY. https://t.e2ma.net/click/z0o9j/j4ojpr/zg1l6b

http://www.screencast.com/t/xKQPNMqMTzZ Last three weeks, went to 12/12 on 12/25/2014

Another 3 week time lapse, wrong link

I am not a total expert on this, but that power supply doesn't look like a Constant Current model. You want CC fed to COBs.

I always blow air on my heat sinks. That way you are sure to get air moving over the hot surface. When it is hot, do you want to stand in front of the fan or behind the fan? I had some sucky computers too, TRS80 was the worst.

8 3070s in 8 sf will be perfect

10 of each is the safe choice :)

That is the answer I see most, the roots fill up whatever volume they are given, so I guess the bigger the better?

Is there a generally accepted root ball shape? It's it a Christmas or an up side down Christmas tree? Or maybe a cylindrical shape, i.e. Long and narrow. Just trying to decide the best planter shape. Can a planter have too much volume indoors?

Why do they mention 5000K on the AB bin 3000K?

In the two examples you cited, the cost to dissipate a unit of heat is about the same, so even tho you can get more cooling per inch on the 10 inch unit the cost is proportionately the same as the 7 inch unit. Correct? So is a deciding factor the length needed and that relationship to how much...

Steve's rocks.

I think one 3070 is all that unit will handle

I don't see a significant difference in the cost for those items, what do you suppose is the determining factor in purchase?

http://www.screencast.com/t/pgqBwfDSa Thats my WW after a few weeks in 12/12, about 2 feet tall, with a screen

Haven't posted much lately, but the growth is amazing over the last three weeks http://www.screencast.com/t/pgqBwfDSa The black flashes are the tail ends of the 12/12 period

I might have placed on set of cobs in the middle of the fixture and the other 1/2 the way between there and the edge, not on the edge. The heatsink will dissipate the heat better that way.