Kessil A360X vs Radion XR15 Pro Gen 6

24×24×24 SPS-only cube

Pick: Kessil A360X

Kessil's narrow column of light hits SPS tips at 600+ µmol/m²/s where they want it. Pair with Mobius shimmer settings for the disco effect that nothing else replicates. Acclimate slowly — bleach risk is real at 100% power.

48×24×24 mixed reef with both SPS and LPS

Pick: Radion XR15 Pro Gen 6

You'd run two Radion XR15s or two AI Hydra 32s to cover this footprint. The wider spread and 5-channel control let you build a gradient — SPS bright on the top rock, LPS at lower PAR on the bottom. A single Kessil leaves dim corners.

Softie / zoa garden

Pick: Either works

Both fixtures are overkill at 30-40% power. Buy the one whose app you prefer. The Kessil simpler controls actually win for low-maintenance softie tanks.

Reefer who hates app dependencies

Pick: Kessil A360X

Kessil A360X has physical knobs on the fixture that still work without an app. Radion is app-only post-setup; if EcoTech's cloud ever goes dark, you lose remote control.