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1156/1141-base fixtures are everywhere on RVs, trailers, and tow vehicles, and this 6-pack of LED replacements is made to survive the voltage swings that regular bulbs don't handle well. Each bulb runs on a 10-24 volt DC range, so it's suited to house batteries, converters, and the occasional voltage spike.
A practical bulb swap for RV, auto, and marine owners who want lighting that won't quit the first time the voltage jumps.