What kind of light? LED / fluorescent lamp / incandescent lamp? How much power? 1 LED, light for a room or a stadium illumination?What switching frequency? Hours? Minutes? Seconds? Milliseconds?How exact should the frequency be?Are the frequency / the duty cycle fixed or flexible?Very simple solution: (not meant seriously)- Get a switch that can handle voltage and current of the lamp.- Put it in series with the power supply and the light.- Get a minimal wage labourer and tell him/her to switch thelight on / off / on / off ...
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Have you heard of "Transistor Man" ? He's willing to work at any hour of the day, for wages that are very reasonable. ;-) Larger image: https://www.instructables.com/file/FO8NV9JG3TDVZ1D/
http://wild-bohemian.com/electronics/flasher.html http://www.cappels.org/dproj/simplest_LED_flasher/Simplest_LED_Flasher_Circuit.htmlhttp://talkingelectronics.com/projects/FlasherCircuits/Page83FlasherCircuitsP1.htmlhttps://www.instructables.com/id/How-to-make-an-alternating-LED-flasher/ simple working u not ?
Buy a flashing LED it will do everything for you.
I'd suggest a circuit based on the classic 555 timer IC. There is are numerous projects on this site and elsewhere about that IC and flashing light type applications based on it.