Not from my personal experience, but through researching which LEDs, I have found people see the AI H-HDs and radions as the best.
Most people find them relatively equal spectrum wise to each other (they do use almost identical LEDs). However (i assume) due to the lenses and LED placement, some people find slightly different results between the two fixtures.
What I see as an upgrade to stand alone 26 HDs would be either:
1) T5s with Kessil combo
2) multiple 52 HDs/xr30r pros - aka more fixtures dimmed down
Although this is more relevant for SPS reefs.
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