it's not a flasher, it's a regular LED light with option to turn on 4 or 6 LEDs.
it's used on cars or boats.
boats have multiple batteries and require 36 volts to run some equipment such as trolling motors.
i originally wanted to protect the driver chips from voltage higher than 24 volts but after testing, the chips survived 42 volts.
so now all i want is to protect against voltage spikes and add a fuse in case the TVS shorts.
i don't know if the fuse with 400 mohms resistance would inhibit the TVS?
thanks

Use a fuse rated just a bit more than the current draw of the light. Then if the TVS starts to conduct the fuse will clear before damage is done.

 

Use a fuse rated just a bit more than the current draw of the light. Then if the TVS starts to conduct the fuse will clear before damage is done.

that's what i'm going to do. the light draws 0.8amp so i will use a 1.5 resettable fuse for entire light. i hope the polarity diode can withstand the current long enough to blow the fuse. i guess it wouldn't matter if it shorts, then it will blow for sure. if it blows open doesn't matter either.
i will use a 1amp quick blow fuse just on the TVS diode.
a SMBJ diode can withstand the current long enough to blow the fuse without damage. this gives me the proof i need of excess voltage. i just hope the small amount of resistance through the fuse doesn't adversely affect the TVS catching spikes.
after adding second driver instead of 1 for parallel strings and adding fuses, i feel pretty confident about the design.
thanks to all.