Reddit reviews HQRP 31mm Festoon 4 LEDs SMD LED Bulb White for 3021 DE3021 3022 DE3022 3175 DE3175 6428 DE6428 6430 DE6430 Replacement plus HQRP Coaster
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HQRP® Festoon LED Bulb plus HQRP® Coaster;Bulb Type: 31mm Spade Base; Lumen: 72;Lumen Color Temperature: White 6100K; Working Voltage:10 - 30 V DC;Power: 0.9Watt; LED: 4 LEDs, SMD5050;200 days warranty!
For backup lights, I switched to these which were much brighter.
For dome lights, I switched to these, which were also much brighter (and whiter) than stock. Power consumption is dramatically less than factory incandescents 0.7W vs. 6.7W so you don't need to worry about battery drain.