Hey, my friend was wondering how much is too much light? Currently he has 3 week old plants. They are under 150 watt HPS, 27 watt compact cfl, 68 watt 24 inch long cfl, and a 168 LED grow bulb. We were wondering if this is too much light? Can a plant get too much? BTW, plants are 5 inches away from hps.
I think it is too much light when the plants starts to hurt from it, the tips of the plants will start to turn white over time. Use your hand, if it is too hot for your skin, the plant won't like it.