8 QB 120/132 =$240
horticulturelightinggroup.com
Are you recommending 3 drivers to stay under 75w each? I've seen several running 4 qb132s from one lrs-350-36? So evidently they can handle 87.5w each?
Thanks. I like the 2 fixture idea. The qb288s also do not require heat sinks?Right now I'd suggest v1 QB288s from HLG.
QB288 V1 Quantum Board
Ultra High Efficiency LED Boards for DIY. QB288 has 288pcs Samsung 561C for 5000K or Lumileds 2835HE for 3000K
Personally, for a 4x4, I'd probably go with two 3-board 288 builds, each powered by an HLG-320H-54A. That provides the flexibility to adjust one side for unpredictable canopies, and having a second fixture in play is a nice redundancy if one fails (highly unlikely).
Was gonna say same, but heatsinksRight now I'd suggest v1 QB288s from HLG.
QB288 V1 Quantum Board
Ultra High Efficiency LED Boards for DIY. QB288 has 288pcs Samsung 561C for 5000K or Lumileds 2835HE for 3000K
The sale is too good to pass up for boards like the QB120/QB132. Don't get me wrong, they're great boards (I primarily use 120s myself), and they can certainly make for an easier build (no heatsink), but the 288s have more headroom and at that price, why not? You could do anything from keeping it cheap and simple with 4 boards and an HLG-480 driver (they really put out more than 480 watts) to going for more spread and efficiency, with 6 boards and either a couple of 320 drivers or a single 600 (slightly more expensive than two 320s, but then you only have one driver to wire). Or cover the whole damn ceiling with them and mix and match drivers to hit your target power.
Personally, for a 4x4, I'd probably go with two 3-board 288 builds, each powered by an HLG-320H-54A. That provides the flexibility to adjust one side for unpredictable canopies, and having a second fixture in play is a nice redundancy if one fails (highly unlikely).
500w amongst the 8
Thanks for the advice. I think I can come up with a sheet of aluminum to act as a heat sink. If I can negate the cost of the heat sinks, I probably would prefer the qb288s.
Now that's a good idea. The 4 heatsinks are only $120 tho.
The word around here is that Stephen from HLG says you shouldn't run them over 50 watts without a heatsink. But as you've said in a subsequent post, you can use sheet aluminium. Or, as Airwalker pointed out, four sinks from HLG will cost you $120 (not sure if he factored in the 10% forum discount).
Now this, is something we all need to consider.
Until a time when technology gives us 'light w/out heat'. I'm sure it's coming.
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