The Gustafson # 277-000322 RV Vanity lamp uses a 921 bulb.
A warm toned LED bulb like # DI48VR which are sold in a quantity of 2 would be perfect for use in an RV bathroom. LED bulbs draw only a fraction of the power used by an incandescent bulb, and last much longer. These bulbs are rated for up to 50,000 hours.
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