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Swap out dim, heat-generating incandescent 921/906 bulbs for these bright white LEDs from Diamond Group by Valterra. They're built for multi-directional or side-mount fixtures common in RV interior and exterior lighting, and the low draw is easier on your battery than a stock bulb.
Each pack includes two bulbs rated at 215 lumens with a crisp 5500K daylight color temperature, and they're fully dimmable when paired with LED-compatible dimmer switches.
A simple, affordable way to brighten up fixtures that use the common 921/906 bulb base.