I think something like this might work for you.
Use a good quality cap so it will have low internal resistance. Usually ones rated for 150C are good. Use a voltage of 50 volts or higher.
The circuit uses a single FET driven by your 555 circuit. The resistors don't have to be large if the pulses don't get to close together. This put about 7 amps thru each string of 2. So more light than 1 at 30 amps. Use the 12 volts for your 555 circuit so it can drive the FET.
Use a good quality cap so it will have low internal resistance. Usually ones rated for 150C are good. Use a voltage of 50 volts or higher.
The circuit uses a single FET driven by your 555 circuit. The resistors don't have to be large if the pulses don't get to close together. This put about 7 amps thru each string of 2. So more light than 1 at 30 amps. Use the 12 volts for your 555 circuit so it can drive the FET.
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