For a 5x5 800w to 1000w for flowering would be ideal. 800w is 32w per sq ft, 1000 would be 40w per sq ft. Higher than my 37.5w flower tent but would be what ld shoot for in a 5x5. Hope this helps. Id go with bar type lights for spread. As close to covering as much area as possible. Hydrotek has nice light but very expensive, a few really high powered leds out there too. Best of luck and shop around, not all chinese lights are crap. Use american myself though.
Check these reviews out GL
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20w per sq ft is quite low but if for veg your on to something.
Go by wall wattage, not avertised wattage. Most N am lights are truthful about wattage, watch chinese knock offs, Meiju is good chinese company, proper!
I was looking on Kajiji and guy selling 1000w lights for 800 canadian. Im in 4x4 soo need 600w min for flower, could do with 440w min if had to. Id get highest wattage l could but spectrum is more important than power. Imo only. I bought a comercial light, used 2 months for less than third rrmsp. Its 5k with added 660s, l love it.
