How close should lights be

A question from a fellow grower:

I would like to know how close I can keep my 600 watt metal halide light away from my cannabis plants without hurting them i here that it it isnt hot on your hand it is safe for plant but what about the infer red spectrum, will that dry or burn if to close? and also I would like to know how far I have to keep my 600 watt high pressure sodium bulb away from my cannabis plants, same question as above, both lights are in glass covered fixtures and they are fan cooled

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