The 921 bulbs in our camper got very hot and the headlights broke due to the heat, and I didn't like the yellowish light either. I have replaced 20 light bulbs with these LED bulbs and love the light they turn off, the light is much better, these LED bulbs don't get hot and use very little power, the reverse fan turns on when three or more bulbs are turned on are . With standard auto bulbs I can turn on all the lights without turning on the fan.
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