When to turn LED to max power?!

Thanks guys I've turned em up giving em 100% at 24"

When I was running 2 TS1000 in a 2x2x4 I never turned them below 100% I started at 32 inches and brought it down every other day till it was 20 inches and then raised the light as the plant grew. Now I run the 2 TS1000 and a Master Pursuit 500w CMH from growers choice. They all stay at 100% and I let my plants grow into the lights now at the very top of a 4x4x6.5 If you want short bushy plants with close nodes you want to be 20-24 inches at 100% the entire veg, then for flowering 16-20 inches. If your plant can take the heat and light during flowering then 12 inches. Everyone grows different. Some like some stretch and others dont. If you grow a specific strain a few times and Master that strain and light, you'll learn how much you can push a plant and what you can do and get out of it.