I have a 4x4x8 tent. Is the Spyder Farmer 4000 enough light for this size tent?
That light would actually flower a 5x5.
So yes. And then some.
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It looks like 450w at the wall.
Typical lighting needs about 50w/sq foot, but if you believe their “ Energy Efficiency with 2.7 umol/J” claim, it’s closer to 35w. So… maybe 
I’m just not a fan of most amazon lights/marketing.
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Why not just get 2 hlg 260xl for only a bit more ? Would be recommended over sf. Only like 100$ ish more. After discounts. Assuming you don’t already have the light .
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+1 on 2 HLG 260XLs. You get a little better light and the 2 fixtures gives your some flexibility to move things around if you want. Two of these bad boys is ideal for a 4x4.
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