Most of us old folks go by watts per. sq. ft. -n- not lumens .

Lumens could be from weak ass cfl , led sources that are almost usesless once the light source is less than a foot away from it's target . = reasoning for watts -n- not lumens .

Do a search here and at the other sites for "watts per. sq. ft."
your gonna find 40-50 to be optimal .

Why not a pair of 1000's if it's a lumen booner you have ?
2-1000w hortilux = 290,000 lumens where as 2-600w only = 200,000 lumens . 2-1000 = the lumens of 3-600w.

Crispi :jointsmile:
xcrispi Reviewed by xcrispi on . Grow room size plans: Lighting/Lumens/Space per plant? Got a few plans i wana check over if any of you guys can help me that'd be great, So far my plan consist of a grow in a rectangle spare room. The room will be split in two by a curtain made of white, light proof, sheeting. So there will be two grow rooms running at once, so that as plants come off veg an go into flower more can be placed into veg. Veg room = 1/3rd of total space Flower room = 2/3rd of total space Rating: 5