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@oceanarium
Thanks! In fact all LEDs move theire spectrum a bit when getting warm (check good datasheets like Cree) (called temerature drift). So if you buy a 400nm UV-LED, you can expect 410nm at normal operation!
Conclusion: As deeper you deal with this LED light and coral demand, as more you know that you can't precice deal with it and have to think more general.
Just my 2 cent,
Sven
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