12v light bulb... if i remember correct each 1157 bulb using both elements is about 2.1 amps draw so to get 5 amps ull need like 3 bulbs..there are still reactor dischargers on the market from 10/15/20/30 amps..simple adjust the internal pot on back side of board to get it to correct voltage of 7.85 to 7.65.. there was a step by step how to do this by drilling hole in front totally wrong info.. its on the back facing board not front facing..its by some one called jimmy..https://www.tqrcracing.com/shop/prod...ALw_wcB#images

with a amp meter you can check how many amps the bulbs will be drawing.. there will be a slight increase in amps as bulbs get hotter.. i installed a fan on mine that runs off of main power plug.