I run x2 4x8's for flowering and had x2 600's per tent and wasn't happy with the yields and quality compared to the days of my 1k's. Just didn't want to deal with the heat, AC, and power management issues trying to juggle 1k's in tents again... I rent my place so I'm not able to install a mini-split or subpanel, hence going with something around 600w. Anywho.... Dropped $2400 on x4 dual bulb CMH fixtures with the phillips bulbs as I heard how much "cooler" they ran and how they blew 600's out of the water. Bullshit. Not impressed. Now I had lights that I couldn't air cool. Good quality, just again, not worth the price.
Last house had an unfinished basement so it made cooling easier running a passive setup in northern alberta ambients. Now we've moved, basement is finished, and the window banger was struggling to keep shit at 75F. Running passive I was at 85F.
Decided to try going LED to cut down on the temps. Dropped $2k CAD on x2 Meijiu A8-650w 8 bar panels off Alibaba. Cut my temps down to 77F with no AC, and x2 CMH still pounding in the opposite tent. For me its worth it to have x4 less bulbs running hotter than hades. I could easily cut out the other x2 CMH and be running an additional x4 of these panels without turning on my AC (if I dump another $4k). I don't have a PAR meter. Best I can do is a lux app. Ya ya, i know. Regardless these panels are doing the same output at 60% as my CMH are doing. And they're doing it with next to no heat. The catch? Dealing with the fuckshow due to one of the lights showing up damaged and having a chinese sales rep convince you that a 2% discount on your next order is the best they can do to rectify the situation.
Point I'm getting at is that if you have a few dollars to spend, then LED is definitely worth it... But I'm first in line to find a dealer in North America that can provide some customer support and a light that isn't twice the cost of these ones. The lights were only $550, but the shipping was $200 USD each... I'm no lighting expert, but I was seeing mainstream LED panels going for 2k-3k so to pay 1k for a chinese brand was worth the risk to me. The industry needs to hit a point where its financially feasible for people to get their feet wet with something that IS comparable to what they've been using for decades. Sorry for the novel, just my input.