It should be fine if it's just a couple blades... couple things you can do with a plant that grows too fast:
Tie it down
Put something like a screen or a piece of plexiglass between the plant and the light
Use flouros (don't burn if the plant is well-watered)
stinkyattic Reviewed by stinkyattic on . Leaf Burn (Lighting System's Fault) Okay, so i'll get right to it. I've never experienced a problem like this before, because i've never had a plant stretch as much as this BG (Bubble Gum) strain i'm working with right now. It's 3 weeks old and 12+ inches tall. Working on it's 6th set of branches, and i'm already seeing non-distinguishable signs of sex. Anyways, a few nights ago, I turned off the light to give it 6 hours of darkness (i'm working with 18/6 here), and when I woke up, 4 of the leaf blades on one leaf were burned, Rating: 5