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Although they are mostly used to supplement t5s, that is only the blue plus and sky blue colors. Many frag tanks use these to light longer, shallower frag tanks even with acropora easily (like a 20 gallon long but usually much larger tanks). The reef day is full spectrum (white) and either use 1 reef day and 1 blue plus or sky blue or 1 reef day, 1 blue, plus, and 1 sky blue, just depended on whether you like a bluer tank or want more par. They use the same leds as the much more expensive orphek icon but are a lot cheaper as you dont have the controllabilityif i was to go with the kessil, i would get 2 of them and put them at either side of the tank. I looked at the orpheks bars and unless you see something I don't, they are only supplemental, not primary use.
A reef bar like quanta reef, orphek or reefbrite will all put out more par (useable light by corals needed for health) than a current usa orbit. Current will work but par is less. I would not go with the current usa for the loop system, them as a brand are pretty lower quality compared to other brands, but if controllability is important look at the smatfarm g5 led.
They are about the same quality as the current usa but have a lot more useable controls, more par output, and give more access into the aquarium.
Also i could link some similar quality leds or higher quality (more money most of the time unless you lose controllability which isnt necessary always like the orphek or3 bars)