[he majority of time its moisture on the leaves that causes them to curl up and even spot or discolor where the water droplet was/is . Here is what happens; you spray your plants down lightly or heavily... the leaves soak up water almost allthe way thru... your lights heat that water and the leaves curl...evenly if watered heavily or complete coverage.....with spots if just misted or sprayed.

If you must water or clean your leaves, use soapy water to battle spidermites or whatever, NEVER DO IT WITH THE LIGHTS ON!

wet leaves and any radiated heat at all is a bad thing and i start all mine under CFL, so i have learned this important lesson twice, once with HPS as well.

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"Inna di mud me uh pick cali bud"

Tha' Mouse