A question about indoor lighting

[CrimsonUndertow]

I have 4 girls in flowering with a 400w HPS, I was wondering whether I should add another 400w for better yields. Do you guys think it's worth the electricity cost. I have a 400w HPS and a 400w MH from my old grow room that I don't use. How about adding another 400 MH lamp?

 

[FruityBud]

What size is your grow area?

 

[CrimsonUndertow]

About 5 square meters.

 

[Hick]

.."5 sq meters" ...is slightly over 50 sq ft. ..2-400 watters (54,000 Lu/ea) isn't close to optimal lighting.
2- 1 thousand watters is pretty close though... (150,000 Lu.ea.)
5,000 lumen per sq ft...OR.. 16400 Lu. per sq meter is considered "optimal"..

 

[Johnnyrotten123]

Those four girls have alotta room to play/grow in!! I see trouble ahead