There are several reasons the mitras are far superior in my opinion. The Mitras spread the pucks out better so less shadowing. The Mitras have 72 LED's running at lower amperage vs 42 LED's running at max. The mitra's will last longer! The Mitra's have a better power supply. Power factor on Advanced Aquarist review of the Radion Pro was .54 vs .99 on the Mitras. Hence a low grade PSU and or underguage wiring while driving the LED's hard. You will have higher amperage on the Radions which doesn't affect your power bill but does generate extra heat and is not as efficient. The Mitra's are PWM dimming vs Current dimming so you don't get color shift at different levels of brightness. We don't like color shifts. The Mitras have 4 fans evenly spaced vs one fan on the bottom of the fixture.
The Mitras (6200) basically have a 2-1 ratio of whites to royal blues. Three different color whites that average to 6200K totalling 30 led's and 12 royal Blue. The radions have 1-1 ratio of 8 white 8 blue. So you get more blue and "pop". They both have violet. The extra LED's is the extra $100. I'd much rather have 30 extra LED's and run them at lower amperage to get more life out of the pucks. The bells and whistles will come as both companies compete. But my concern is not to let the bells and whistles cover your eyes to the underlying differences in the fixtures. To me one is really working on the heart of the fixture for reliability and longevity while another is making things with cheaper core parts, ramping up the amperage, and adding some flashy bells and whistles.
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