COB LED. Have good penetration.I'm working in a closet guys , an hps /mh system would be to extensive , not money wise just won't be able to run the duct into the main room can't burst holes in these walls .
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Need light to lower leaves . Not as strong as they should .
There are alot of good LED companies. Should be more specific on your comment to let the OP have more details.DIY COB LED.
Don't buy a bullshit LED light you'll regret it.
Don't buy a 315 CMH as the cost to buy one of these is about the same for a small COB light ant it will nearly double the efficiency of it, while saving you on electricity per month.
I never said anything about heat. Obviously they produce heat. All depends on the efficiency and how soft they are run.Mars hydro's are not heat free.
I run a 2x2x4 clone/seedling tent with a Mars2 300, 180 wall watts. It needs to be vented or it will get too hot.
COB will far out yield a DE watt for watt.DE HPS
COB LED if heat and power consumption is a priority.
Wow, can cobs really get 1.4+ g per watt? That's amazing! I hear the 315cmh can get 2gpw, been hearing the hype alot latelyCOB will far out yield a DE watt for watt.
COB pays for itself in first grow.
I have calculations.
DE is hot as shit.
COB gets warm but easily manageable.