If your going to run it through a 100 gal system, just hang a 70 or 150w MH over it. I've got a 150 w sunpod over my 24 gal, pretty happy with it. I couldn't decide between that and a Viper, the wife decided the sunpod looked better. The only thing I don't like is the heat it produces, it raises the tank temp about 2 C. Not bad in the winter, but a bit hot in the summer.
With the popularity of nano tanks I can't believe current is the only supplier of 18" bulbs. There has to more coming down the pipe but atm they have a bit of a monopoly.
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