Ca and alk balance and stability will have a much stronger and more immediate impact on coral health than lighting. Read up on UV. you'll find very little science and a whole lot of conflicting opinions and anecdotes. One thing to remember. Look up led success stories. There are plenty. Only kessils contain UV light. The lions share of success stories are with radions and AI sols. No UV in either.
Lastly. Ignore manufacturer stats. Companies like reef breeders, reef radiance, ocean revive, ecotech radion, ai hydra 52, ghl, ect all claim to contain "x number of 420 nm UV's or x number of 400 nm UV's" in their lights. Those are all violet. Not UV. UV light is specifically that which falls BELOW 400 nm and is invisible to the human eye. That's just catchy marketing jargon on their part. Violet is more beneficial to photosynthesis than true UV is anyway. That's why if you look at a kessil multichip close up, a handful of black spots will appear amongst the array of colored diodes. Those black spots are actually 395 nm UV diodes. The eye cannot see it so they look like dead LEDs. They're not. Just FYI.
Hi Bpb,
Good point. However we don't advertise that we have UV on our lights because we don't. We advertise our lower NM actinics as Violet.
You can go to www.reefradiance.com and check every light on our site and you will not see any UV listed.
Rick