Not to piss people off but wouldn't it be much more fair running a cheesy single light source under 110w. That should be more then enough.
I know whatvi can grow on the edge of a Pro-4 w/ just one cob/mono (125w) array & I'll tell you what, it's about 100x or more bigger then a party cup bud.
I don't think that's right for a cup challenge but then again I'm just a superior newb, what do I know.
I leave it to the old Dawg to decide.
One led light or one led configuration per cup enclosed or shielded .... OR .....
Place your cup in your led room letting all LEDs grow your cup?
That's risky buss. & not very controlled.
Wow! I just looked it up, Damn Dawg, you've been running this shit since 2010? Mad props bro. I understand why you'd be vexed about another comp starter. Worked to hard at this to long.