Lighting for Flowering Question

Hey so the strand is Grand Daddy Kush (Grand Daddy Purp X Hindu Kush). Just finishing up preflowering under a 150w HPS. I was just curious how far I should keep the lights from the plants during flowering. The lights were about 6" away during preflowering.

Thanks and Happy Growing

Distance can be determined just by placing your hand under the light fixture. After a minute or so if your hand does not feel hot then the plants will be ok at that distance.

there is a distance chart that someone posted somewhere on these forums that will tell you how many lumens your using compared to how close/far your light is from your plants. im not sure exactly where its at but if you do some looking im sure you'll find it. peace.