Actually the plasma arc inside the HPS can burn as hot as 2000 degrees F, the vessel the arc is in is made of polycrystalline alumina, or single crystal alumina aka sapphire, the arc tube is essentially buffered by the vacuum and bulb, keeping it from melting(made from vitreous glass in most cases) thats why they are so damned expensive.

As far as your space goes, get a bathroom exhaust fan ($20-30 bones); that will be enough, just make sure you have a way for air to get in too.

And yes I too am :stoned:
4x5 Reviewed by 4x5 on . Awnser This Question Win A Cookie =) Exactly what tempature does a 400watt HPS bulb reach? and how many cfm's does a extractor fan need to be to assist removing this amount of heat from a 8x3x1 closed room? Rating: 5