Auxbeam 921 LED Bulb Reverse Light, 921 Bulb, 4000LM, 6500K White

Long write up, hopefully this helps you if you're considering these. Only been installed for a couple weeks so can't comment on longevity. I checked for EMI by tuning to a weak radio station and putting the tuck in reverse to turn on the lights. There was no interference. (Side note...I have the Putco light bar bumper grill insert which creates EMI. Unhappy it has EMI for what it cost. I have 3" Vision X CG2 Light Cannon's and they are clean, no EMI) This Auxbeam bulbs's light output is definitely better than stock. Reasonable for the ~$22 cost. I didn't measure the light but I doubt they are 4000 lumens. Incandescent 921 bulbs are around 260, the effective light behind the truck is not 7 times brighter in my opinion (assuming 2000 each, 4000 for the pair). I have tinted windows so I need more than these bulbs can supply. (I wasn't expecting 4000 lumems - I assumed it was marketing baloney) I didn't want a higher power bulb since I was concerned about heat. Bulbs that replace the entire socket so they can have heat sinks external to the housing may be OK, but I was concerned the light pattern could be sub-optimal since your limited by the stock housing. Instead, I am going to add the Morimoto backup light boost bar. That seems a better option for ~$80.

Very pleased with these. Alot brighter then factory taillights. No flickering of lights Running 2018 gmc yukon denali.

They are amazing bright, i only buy auxbeam lights, they are the best to me... i will sure buy these again !

Bright. Seem to be a good quality. Time will tell

This LED reverse bulb is a game-changer! Installation was quick and easy, and the difference in brightness is unbelievable — it lights up the entire area behind my vehicle, making reversing at night so much safer. The light is crisp and clear without any annoying glare, and it comes on instantly with no delay. It’s energy-efficient, runs cool, and feels solidly built, so I know it’ll last a long time. If you want maximum visibility and a clean modern look, this LED reverse bulb is a must-have upgrade!

The good, the bulbs were bright with nice intensity and throw pattern. Unfortunately, on my 2018 Buick Enclave, when installed they would cause an electrical gremlin that would activate the 360 camera system any time the vehicle wasn’t off or on accessory mode. Once removed the problem abated, this was trialed twice with the same outcome. I have used these bulbs in other vehicles that were older with less advanced tech and no errors resulted so I would still recommend.

Extremely bright lights up the whole behind of the truck can practically use it as a work light

Installed these Auxbeam LED reverse bulbs in a 2008 Hyundai Santa Fe, and the difference over the factory bulbs is night and day. They are extremely bright, clean white, and actually put enough light on the ground behind the vehicle to make backing up at night much easier. Installation was completely plug and play and both bulbs worked perfectly. The projector design does a good job throwing the light outward instead of just making the taillight housing look brighter. The before and after pictures really show the difference. They’re definitely bright, but for reverse lights that’s exactly what I wanted. Very impressed with them so far and would absolutely buy them again.

Very bright as expected! Highly recommended!

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Excellent upgrade, used these to replace my reversing lights on a 2012 Jeep Grand Cherokee, the difference in lumes output is significant!!

Excelente iluminación

Excelente iluminación