Qb Spacing Questions

Can you tell me for 2 boards ?

And for 4 boards ?

Now how about heat sink can I use 1/8 “aluminum or thicker ?

The size of the board or 40” x 40” for 4 a4x4 tent

Depends on how hard you want to push boards. 50 watts per board or less would be fine. If you want to go harder I would buy the factory heatsinks.

To light a 4x4 with 4 boards you’ll need to drive them at 2100ma, which will need the factory heatsinks or equivalent. Two boards per driver hlg-240h-c2100a. 4 boards per driver hlg-480h-c2100a.

I have a lot of 1/4” aluminum plate that is free
How hard do you think I can run 2 boards with the hlg -240h-c2100a if I make my Heatsink 2” bigger all around, sand down the plate to get good contact ?

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Probably full power. You could always add some channel to the top later to increase cooling surface area if need be. What kind of space are you trying to cover with the fixture?