Is this light burn?

no

 

There is nothing wrong with that plant. Light burn will turn the green leaf white. Go away and leave your plant alone. It will grow at IT'S PACE...not yours. If you have it's basic needs provided for and it under sufficient lighting for vegging....it needs nothing from you UNTIL it's almost dead dry. At that point and ONLY that point, you may water again. But NOTHING ELSE...no nutes, no additives, nothing. When they're small, they need to be left alone to grow. How fast that happens, depends on the quality of light they're growing under along with the strain of the plant. The indica strains have very tight nodal spacing and it seems they grow much slower than the sativas. They're just short and bushy. I hate messing with them. LOL They don't like heat and we live in the SE US where heat and humidity are the name of the game around 9 months out of the year. So I tossed those. The sativas do great in our part of the world though. Good luck. TWW