I have owned both fixtures and the Radion is by far the better fixture IMO- better coverage, wireless(less cables), nicer looking fixture, nicer coloring, and better programing+ features. Only thing I prefered with the AI is the lightening over the Radions lightening. I have 2 Radions right now over my 120gal and they look awesome. The AI's are nice but the Radions are just nicer IMO. The Radions are actually cheaper too than the AI's also because IMO you will definately need more than 2 AI's for a 120g. 2 AI's = 1 Radion for coverage. If it was me I would use 4 AI's on a 120g or 6 AI's on a 180g. Radions you need only 2 on a 120g and 3 or 4 on a 180g
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