Although these bulbs are much larger than the incandescent bulbs they replace, the warm white version produces high quality light with the same brightness while using significantly less electricity. They work great in my RV, generate much less heat, are not polarity sensitive and should be a satisfactory replacement for 921 bulbs in most RV lights that have enough space to accommodate them. This supplier sells the same "Green Value" brand of LED bulbs as other Revain suppliers for twice the price. Since these lamps only last about a year under heavy use, the cost of replacing them becomes a factor in their purchase. I was happy with my purchase.
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