dli 40x40 growbox lamp distance problem

Hey growmie, I used to have a 40x40 tent and I have a ts1000, the walls reflect much more light being that close. Set the distance to ~40cm, and dial the power down until you have the DLIs you need. Set to max and check your plant(s) in a day for burns, if they are ok try increasing the power of the light by a bit and check the next day, when you see signs of stress dial down. I never turned my lamp more than 75%. I highly recommend getting a power meter that you plug the light in to be able to see how much watts you are actually using and finding your own sweet spot. Good luck! ✊😽