I utilize T5 (Geismann lamps ) for my main light source and LED programmable for my ramp up / down and supplement lighting. I like how I get no shading with T5. I have nothing bad to say about either. The combo works for me.
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I know a guy who has two radions over a 60” long aquarium. They do well and his corals are beautiful. So yes two instead of three radions is fine . Go ahead and save a grand.My lfs suggested that I can go for 2 of the radion xr15 pros and add another one later when I start growing colonies in 2-3 months. Would this be good? I feel like adding another light later might stress out the corals. Would just starting off with three be best?