Radion XR15 G6 Pro vs AI Hydra 32HD: Which Reef LED?

Both light a 24 by 24 inch footprint, but they sit a tier apart. The Radion XR15 G6 Pro holds even PAR to the edges and syncs with Apex and Mobius, the better SPS fixture. The Hydra 32HD delivers most of that performance for roughly $150 less, the smarter buy for mixed reef and LPS tanks.

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At a glance

Spec	EcoTech Radion XR15 G6 Pro Check price on Amazon	AquaIllumination Hydra 32HD Check price on Amazon
Price	$575 to $625	$450 to $470
Our rating	4.9 / 5	4.6 / 5
Best for	Mixed reef and SPS-dominant tanks from 24 to 50 gallons where even PAR across the full footprint matters more than cost.	Mixed reef and LPS-dominant tanks from 30 to 65 gallons where the Radion premium cannot be justified but performance beyond budget fixtures is required.
Rated coverage	24 by 24 in, even PAR via HEI2 optics	24 by 24 in, PAR drops more at the edges
Power and spectrum	100 watts, deep 395nm UV channel	7 independent LED channels incl. UV and violet
Control app	Mobius / EcoSmart Live, native Apex integration	Free myAI app with community-shared programs
Street price	$575 to $625	$450 to $470

The two options in depth

4.9 Editorial score Aquarium Specialty

EcoTech Radion XR15 G6 Pro

The standard against which every other reef LED is measured at the 24-inch coverage tier. The G6 generation introduced the HEI2 hybrid optic system and pushed deeper into 395nm UV for coral fluorescence. At 100 watts with a 24-by-24-inch even-PAR footprint, the XR15 G6 Pro drives mixed reef and SPS corals from softies to Acropora without hotspots.

Best for Mixed reef and SPS-dominant tanks from 24 to 50 gallons where even PAR across the full footprint matters more than cost.

HEI2 optics produce even PAR distribution across the full 24 by 24 inch footprint without center hotspots
Integrates natively with Neptune Apex via Mobius and EcoSmart Live for automated sunrise, sunset, and storm sequences
395nm UV channel drives coral fluorescence visible at 395nm that most competing LEDs do not reach
Premium price is the highest single-fixture cost in the category

4.6 Editorial score BRS

AquaIllumination Hydra 32HD

AquaIllumination's mid-range flagship, the Hydra 32HD runs 7 independent LED channels including UV and violet, produces over 20 percent more LEDs than previous generations, and is controlled by the free myAI app. At $459, it sits between budget options and the premium Radion tier and grows most coral types effectively.

Best for Mixed reef and LPS-dominant tanks from 30 to 65 gallons where the Radion premium cannot be justified but performance beyond budget fixtures is required.

7-channel spectrum including dedicated UV and violet produces genuine coral fluorescence at a mid-range price
myAI app includes community-shared programs for common tank types, reducing setup time significantly
Slim form factor and multiple mounting options suit a wide range of rimless and drilled tank configurations
Coverage footprint is rated for 24 by 24 inches but PAR at the edges drops more than the Radion at the same claimed footprint size

Which should you buy?

Buy the Radion XR15 G6 Pro if the tank is SPS-dominant or you are building an EcoTech and Apex ecosystem; the even edge-to-edge PAR is what justifies the premium. Buy the Hydra 32HD if you keep a mixed reef or LPS-leaning tank and would rather put the saved $150 toward flow or testing. Neither choice is a mistake; the Radion has the higher ceiling, the Hydra the better price-to-performance.

Common questions

Can the Hydra 32HD grow SPS corals?

Yes, in the center two thirds of its footprint. Acropora placed at the edges of a Hydra 32HD will see noticeably less PAR than under a Radion at the same spot, so plan placement or add a second puck on wider tanks.

Do both lights work with a Neptune Apex?

The Radion integrates natively with Apex through Mobius and EcoSmart Live. The Hydra is controlled by the myAI app and does not offer the same native Apex integration, though its onboard schedules run independently and reliably.

How many fixtures do I need for a 4-foot tank?

Two of either fixture. Both are rated for roughly 24 by 24 inches of coverage, so a standard 48-inch tank needs two pucks spaced over each half to avoid a PAR valley in the middle.