I agree. but really take square footage and find out how many lumens on your bulbs then divide by the sq footage. you want to be in the 10,000 lumens per sq foot for the best results. good luck
as Im a Metal worker and them you buy don't fit my old light, but cost me nothing, cept 3 lunch breaks and a few 10 minutes here and there
and made my temps drop from 30-32C to 25-27C with a Ambi Temp out side the grow room on around 24C best thing I ever build