From my personal experience the Odyssea systems are excellent; however the bulbs are not great at all, I have been running Odyssea light on smaller aquariums for a long time, and they have always been up to snuff.
Hanging will still give heat back into the aquarium mate, if you have a controller with a temperature probe you could control a small fan blowing on the surface to help exhaust some of the heat, I have a 178w MH Odyssea over a nano cube now; the light creates quite a bit of heat, however does an excellent job of lighting.
Plan to have a little bit of air movement over the top of the tank, and I think you should be just dandy.
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