12 Inch 8 Watt Light Dimming

Aug 12, 2007
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OK i'v got my tank its not that old prob about 6/7 months old, and recently I'v noticed when I switch the light on it dims down to nearly nothing after about 1-2 mins

It switches on fine with no problems, then its will just dim right down with no notice.

I went and bought a new bulb to see if that was the problem, but its doing exactly the same with the new bulb aswell now.

Any help on what it could be and help on fixing it would be great! Thanks!