A few reasons really. I wanted something more low profile that fit in my canopy better, I wanted to raise the Kessil's for better spread but didn't have room. I probably should have had 3 instead of 2. I never really got the colouration I wanted out of my SPS with the Kessil's (got close though) and the Radions give me a lot more control over colour, intensity and spectrum (including UV). The Kessil's also shut off below 14% but the Radions give me control down to 1% for moonlighting and adjustable colour in every direction (not just blue or white with the Kessil's). Don't get me wrong, I loved the Kessils, but found matching a decent combo of T5's to a colour setting I really liked kind of hard with just the blue and white. Plus the Radion's are PAR monsters! I also saw the XR15wPro's on a demo tank at MACNA and after seeing the Kessil's and Radion's side by side, it was a no brainer (given my goals with my new setup). The Kessil's are amazing LED's for LPS/frag tanks and really offer a set it 'n' forget it setup, I need more control and more SPS.
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