all these sound good and helpfull, really, but what happens if the grower does not have the means to get/buy/find/install a glass on the hood?

in my experience (very low starting budget) it is very helful if you manage to have a fan blowing air directly on the bulb and thus taking the heat away and spreading it around..likewise i was able to get my lights at 6-8 inches from the tops without burning them....of course the optimal would be to extract it out the room, when matters of low budget emerge the solution with the fan comes into my mind first... ;-)