Dim a light

I whant to make a board for a small light house light. The light will be in one posion and the board needs to dim the light, then raise the light, then dim, ect. If anyone has a good idea please help.
also the power supply perferd is batt. (9 volt, AAA, AA)

Thanks
Tony :?

Tshirlen@lear.com

Do you want to Dim/Full the light or make it ON/OFF ???

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