Grow lights

[snum1082]

Hello everyone,

Iam growing autoflower purple hulk everything is going.good so far but I'm still a bit confused about the lights my schedule is 22/2. The grow lights that I'm using is a 50w full spectrum grow light bulbs. I have attached four of them together. and the tips of my plants are kinda burning dont know if that's cuz of the lights or the nutes. I want to know about the distance of the lights from the plant currently they are 22 inches away from the canopy. I have attached the pictures aswell please guide me. Thankyou

[homegrown]

Really hard to tell by the pics. What are you feeding them? and how often? Maybe cut the nutes in half for next couple of feedings and see if it clears up. tip burn is usually too much N