Dying leaves in veg?!

You have a 600w MH, which may emit more UV rays depending on the bulb your using. The amount of liquid that the plant leaves hold or lack of chlorophyll in the leaves can get penetrated by the intensity of the light. Which will give you the burn effect thats shown on your plants leaves. Leaves can release excess water threw there leaves which can will give off a magnifying effect so the light will burn them that way also.
 
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Humidity varies from 30-50%, there is a fan blowing on plants but not inbetween light and the tops of them
 
The air is circulating regardless of where the fan is placed. Dry cool air needs to be over top of the plants for the reasons I gave. If you mean simulate wind to strengthen the plants thats not true. When a fan is pushing the plants only thing its doing is making it harder for the plants to photosynthesize and it flips the leaves over to much and in turn the leaves will grow curvy and misshapen
 
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