Smoking Gun
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Gonna upgrade my lights soon, so I'm looking for any input. What do you guys think, cobs or quantum boards?
Is budget an issue? If not, I would go with the Gavita 1650e LED. It is intended to cover a 5'x5' area, so it would kill it in a 4'x4' area. For how much light it puts out it runs very cool. I like it a bit more than the Fluence Spydr, but that is a great light too. Ultimately it seems, at least to me, that for commercial growers and growers in areas 5'x5' or greater the bar lights are becoming the most effective option.
I made my own light using four HLG 132 panels on a 240 watt driver. It works great for my 2'x4'. While the HLG 600 would kill it, I think its best to run more panels that handle less load and spread them. The HLG 600 is still providing light from a mainly centralized point, which will leave a fair amount of light to be desired along the edges of the tent. A custom built unit will allow you to fill your space with light more efficiently. But for shear ease, the HLG 600 is going to be a great option for a 4'x4' canopy.
But I also think you could run a CMH and get great results too. I wish I had more space because I would absolutely set up a CMH and grow under that.