i know one thing that ususaly gives you an idea of light quality is the colour of your corals and their growth. My mushrooms (red and purple, two hard colours to maintain) have actually gotten deep and brighter since i added these lights. I was going to switch out to guisseman's, but i think i will wait until they actually NEED replacing before i go out and spend another couple hundred bucks on new bulbs.
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Fluval Osaka 41g sumpless tank, 250w MH + 130W PC , DIY HOB refugium, Tunze 9002, Koralia 2, Koralia Nano
Toad Stool
Colt Coral
Purple Shrooms
Red Shrooms
Candy Cane Coral
Hammer Coral
Moon Coral
Copper Banded Shrimp..and growing
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