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Nope, light only for growing macro.if your not keeping micro algae just stones for beneficial bacteria do you need a sump light
I used this before I set up my refugium. This is from Bunnings in Aus, I'm sure other places have a similar product. Its just a stick on strip and battery operated.No - I have lights in my sump purely to make inspection / maintenance easier - especially since the inside of my cabinet is really dark... If you can see all the components of your sump without the need for a light, save yourself the money !