Too much light ?

There is no such thing as too much light in a grow tent. Though the intensity of that light is a different question all together. If the intensity is too much yes it can stunt your plants it can even bleach them white or whatever the colour of the light is your using. though this is very rare and only really found when the light is too low. as long as you have good air flow and dont put the light to low you should be fine :)