The most common rule is 50 watts (minimun) or 5000 lumens per square foot.

Read the 'stickys' in the Indoor Lighting forum
Dutch Pimp Reviewed by Dutch Pimp on . Help!! I Need Some Advice From All You Green Thumbs For 1300 Pk's. We have a medical license to grow and I want to Veg 1300 plants in 5 gallons of pots for two months before I flick. The strain is purple kush. I wanted to veg these plants for two months. My question is how much light will I need. We have 1000 hps and MH. This all begins in two weeks. There is so much info here its a bit overwhelming with such little time... Rating: 5