15w ballast, 10w tube?

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Masha

Aquarium Advice FINatic
Joined
Sep 26, 2013
Messages
996
Location
Cape Town, South Africa
I just bought a new ballast for my fluorescent light, and when I got home, I saw I'd got the wrong kind. The tube is 10w, and I got a 15w ballast by mistake.

I can exchange it, but the place I bought it from is quite a drive away.
What will happen if I use this ballast with the 10w tube?
 
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