Will this light work for a 4x2 closet grow?

it should be fine.

 

Something like this will serve you better for not that much more

Horticulture Lighting Group 135 Watt Quantum Board LED Kit V2

 

How do you figure 135w is better than 500w?

 

Because I don't trust those numbers at all

 

I hear ya, but 135w not enough for me even to cover 1 plant in full flower. I need like 50w per square foot.

 

Actually with QBs..35w per sq ft is just fine..They are about the most efficient lights out there..That 1000w claim is pure BS (might just be a new BS record LOL)..Just another Import here today and gone tomorrow..NO way a Burple beats a QB of similar REAL wattage (put a kill O watt meter on them and see for yourself)

 

LED Grow Lights | Growing Kits & Indoor Commercial Grow Lights
This is the kind of blurple I like, even comes with a fan. A very LOUD fan.

 

I have two under a 100 par light and have to dim it to avoid light stress.