You should get something like the item pictured, in order to add a fuse between the battery and your 12V power outlet, that you stated you had added under the seat with a switch. Make sure that the positive 12V is the side with the fuse. If you've never seen an automotive batter discharge directly to ground then trust me, it isn't something that you want going on directly under your ass, while riding.
Commercial lights are generally already balanced, with resistors etc., to work properly in a pre-existing circuit. If you hacked the LED light strip together yourself, then you are definitely missing the appropriate in-line resistor. Add the ones that you linked and you should be good to go.
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