Am growing 14 plants in a 11'x12' room divided into two sections. At the moment i have two 400w and one 600w HPS in the flowering area,... and 440w of CFL's and 300w of LED over the vegging ladies. I average around 40k Lux over the flowering canopy, around 8k over the vegging girls. My question is this,.. how much light indoors is enough? Never enough i know,.. but with direct sunlight being 100k Lux im thinking that's the goal? But do i really need to double my light? Currently my lights alone add $116 a month to my electric bill, which was $340 total in August, worst month of the year for me. The 7K BTU in the grow room makes up another $60 a month to the bill. I'm in a 1300sq ft apartment (smell is taken care of, plus im legal) just added the 600 HPS but i'm wondering if adding even more light would be recommended? I'd need more AC if i did. At what point does the electric bill start to gain attention?