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![]() My DIY LED unit uses 454nm blues, 6500k, 10000k & 20000k (at least that's what the manufacturer states) wavelengths. I used so many different LEDs to try to account for both PAR & PUR requirements. My theory is that LEDs are more like a rifle shot approach in terms of narrow band wavelengths, so I spread them out to achieve more of a shotgun approach. The corals seem to like the light.
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