Mars Hydro TS1000 hanging height

I'm rather new to led lights. I use the bigger version of that light the ts3000. I've got my light set at 36 inches and run it on full power all the way through, my friend who has the same light as you ts 1000 does the same. I think it's strange how you got light burn when running it at 25-30%. Have you used a pre loaded soil ? Could be that other than light burn. I've fried a few seedlings using the wrong soil and or lights. We grow and we learn.