FourOaks, as Bower mentioned LED won't take extreme heat. Most folks that have diodes burn out don't run an air exchange system. That's why I always run cool air intake and exhaust in my situation. I know the manufacture I use will send you free diodes if you have any burn out. I'm going on 2 years and not one bad diode yet. HID, HPS and MH are old school lighting. They do work. But, you'll pay to run them. I run a cheap batwing hood because I just wanted to run a 1 plant comparison. The light will be gifted to a friend soon.
Have you looked into CMH by any chance. It may give you the best of both worlds for your greenhouse.
Happy gardening..
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