Something like this should work. There are different amp one. These go on a Harley's tail lights to make them flash when you step on the brakes. You could just wire in a switch to make them come on
https://www.superbrightleds.com/more...xoCACYQAvD_BwE
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Here's another one
https://www.superbrightleds.com/more...ler/1105/2620/