i dont know lol i guess i just never thought bout it i just assumed around 400 would be appropriate for my space but honestly for 20 more bucks why not get two hundred more watts thanks
If I cld only run one type of light it wld be 600's in cool tubes....they give you the best bang for your buck lumen to watt wise. I wld choose them over 1000 watters....jmo
craigslist has grand deals if you can find them. there was one person in my area selling two 400 watt hps systems for 120$ together...sadly i did not receive my paycheck in time.