Don't mean to start a debate here, but here are my 2c. As a 4 year Radion then TIR then G3 PRO upgrade customer I'll honestly advice you to consider the costs of going with PUC-based LEDs. Sure, you can get great coverage, but the only way you can ensure it is by having 2 rows of Radions. For a normal 4x2 ft. SPS tank you're looking at getting 4 units. Is it economical? Sure, you can go with recommended 2 units, but keep in mind that shading will get the best of your sps corals. There are literally lines of brown zoox in the shadowed areas that contrast with colorful parts that get the light, I've observed this before adding t5s to my radio setup. I have 4 units spread out over 6x3 tank with 8 t5 tubes flanking the Radions. LEDs are currently on for aesthetics only (most intense after T5s go out for about 2 hours). Another issue that you may have to consider- brightness. It's quite sad that you can only run Radions at low intensity, this makes up for nearly impossible daytime viewing. They're great, after 8PM or so lol. I would consider supplement t5s for Radions along with wide angle lenses, OR non-puck based cheap LED units that you can install a lot of. Sure, you'll be facing other issues like rainbowing and less shimmer, but you'll have best in class coverage.