So I was searching around e-bay and craigslist for a new 400 watt Metal Halide bulb. One of my concerns with the fixture that was just donated to me is that it is a lot bigger than I expected. So I decided I wanted to try and cool tube it. Another is that I'm on a very tight budget, so I cant afford to buy a cool tube for it and would like to make my own, but all of my ideas are being torn to shreds because of the sheer size of the bulb. It's just too wide. Well that's what I thought until I came across the aquarium bulbs. They remind me more of a HPS bulb. Small and compact, and easily cool tubed. I just dont know if it would work with the light setup I have, or if they would even work for growing. Does anyone know anything about using these aquarium bulbs for growing? Please help!

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Just a noob, trying to get a good foundation.

Nearly 5 hours and 18 views later, nobody knows if I can use them. Please help, I'm running out of time.

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Just a noob, trying to get a good foundation.