Some users online do report a slow growth, but in my experience, this is likely attributed to user error.

to 21-inch deep tank with plenty of SPS corals: AquaIllumination Hydra 32 HD / Kessil A160WE Tuna Blue / Ecotech Marine Radion LED XR15 G6 / Kessil AP9XThis was such a tough decision between this light and the AI Hydra 32HD but it really came down to the HEI Lenses giving a more consistent spread of PAR. Before deciding on how many Kelvins the LED lights for your new saltwater tank should employ, you first need to understand what Kelvins really are. Author’s note: Efficient LED grow lights would provide the right PUR portion of the PAR they emit. This eliminates the need for pumping up the light intensity beyond belief as some PAR fanatics in the hobby would want you to do. This is the reason why you could see LED lights that would actually grow corals better than the older metal halides which had immense power. They are one of the best LED lights you could get on a budget and as a bonus, they have tons of extra “weather patterns” simulations such as rolling clouds, thunderstorms, and whatnot.

Using Kessils Dense Matix LED cluster you get high PAR lighting with no ‘Disco Ball’ effect through the water. The colors are seamlessly blended with the added benefit of the shimmer on the sandbed that is very hard to replicate with other LED technology.Though the Radion XR30 PRO would be twice the power of an XR15 PRO, it may turn out more cost-efficient to actually run 2x XR15 PROs rather than one XR30 over a larger reef tank. In nature, during the daytime, calcium growth is fueled by the energy received through light, thanks to photosynthesis.