i dont think you could ever have too much light, but you can have your plants too close to your lights which can make them either get too hott, or get light bleached. i noticed that if i have my l000watt too close to my babes the middle of the colas lightens in color, just by raising the light you can see them darken up. hope that helped bro happy growing. in my experience buds will allow light to get closer without harming them than the leaves or foliage of the plants