Hey bro! The truth is I tried a really good panel in 120cmX120cm, it also had 480w of 3500k mix uv 660nm iR, it wasn't bad, I imagine that if you use and try 480w in 100cmX100cm it will perform much better! Before anything, if you're going to use LED, I 100% recommend using "LED bars" since their distribution in lcm and light is much better than a panel... I invite you to check out my diary to see how 480w looks in a 120cm closet... remember to use bars! ;) Cheers, king!