115 watts per square foot

[herballuvmonkey]

I have found the best way to measure is lumens per sq foot. I have found that 2500 to 300o lumens per sq ft is optimum. CFL's are great for vegin but u don't get the the great size when flowering under them no matter how much u use HPS is the best way to go 4x4 room 400w HPs (45,000 lumens on a 400w hps 45,000/16 sq ft = 2812 Lm/Sq ft. This is not minimum nor optimum but it gives good coverage and when combined with reflective material gives even better coverage. Also when constructiong a grow box build a box with the lite set on the outside. this will give you extra space for vertical growth any built box should be 5 ft-6ft in height. IMHO.

herballuvmonkey Reviewed by herballuvmonkey on 10-26-2006. 115 watts per square foot I plan on using around 115 - 120 watts per square foot during bloom in a room 4x4 or 4x6. Is this way overkill for very high quality mary jane? Rating: 5

[DamianLucifer]

I had great results using 1 400w hps in a 4' by 4' space Wasn't even a grow box just some 1x1's with some walmart emergency space blankets stapled to them http://www.futuregarden.com/lighting...ow_lights.html