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Trreherd actinics go all the way to 470nm. Coralife has a new actinic bulb that is royal blue and burns at 470nm.actanic lighting is blue light(420-460nano-meter)
For what type of lighting you need actinics for the corals to feed on. But it depends on what type of corals yu are going for. You can always get MH lighting and do softies.