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If your RV's interior lighting is starting to look dim or yellow, the StarLights 921-280 is a straightforward upgrade. It uses the same wedge base as the stock bulb it replaces, so there's no rewiring or new fixture needed — just pull the old bulb and press this one in.
Double-check your fixture's bulb size and base type before ordering, since wedge bases come in a few different footprints.