Review on 🚗 Upgrade Your Car's Interior with cciyu 29-31mm Festoon LED Bulbs - Pack of 4 Super Bright White Light Bulbs for Dome Map Door Light and Courtesy Light, DE3175 DE3021 DE3022 3021 5730 3175 6614 6428 7065 Compatible by Ronnie Polk

I've read other people's reviews of these LED bulbs and I couldn't help but think the bad reviews were written by people who didn't understand DC and diodes. . Simply put, they are LEDs (Light Emitting Diodes). Diodes only allow current to flow in one direction. If you use them and they don't light up right away, flip them over. Your car uses 12V DC, and if the diode isn't aligned to match the positive (+) and negative (-) current of your outlet, simply flip the bulb. They also tend to be bright - much brighter than incandescent bulbs. being deleted. There is no law that you have to point an LED lamp so that it points directly at the retina. You can turn these bulbs into sockets by turning them sideways or even turning them back if you want to lower the effective brightness. My visors are rotated 90 degrees to eliminate glare at night.