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... ;-)
newgroweroldsmoker Reviewed by newgroweroldsmoker on . KEEP the LIGHT CLOSE It is KILLING me to watch people grow and keep their lights so far away from their plants. If you are going to invest the time, money, effort, and risk into growing YOU should definitley keep your HID lights as close to the tops of your plants as possible. This means, you will need adequate airflow. Exhaust lights and keep oscilating fan between the tops of the plants and the bulbs. I have been visiting a few garden in Northern California latley and the growers have their lights 16-24 Rating: 5