I've had these installed for a week and so far they work great! I even had them turned on for 30 mins without issue, while trouble shooting a problem with my rear camera in 95 degree weather. I have aftermarket smoked tail light housings and dark tinted windows on my 07 Tundra. These 921 bulbs are very bright, almost like headlights, making it very easy to see. Note, I found it worked best when I rotated the bulbs to a position were as the LEDs are mounted left/right rather than up/down. Even if you don't rotate the bulb to the best position, I'm sure you will find them plenty bright.

very bright, fit was a little loose for my taste in the OEM housing but 2 wraps of electrical tape on the rubber solved that, also the bulbs are meant to be rotated to the optimal angle be sure to adjust them before closing up access

I ordered these reverse lights for my 2006 Silverado and when I got them one bulb did not work. I contacted the seller and they quickly shipped me a free replacement that worked perfectly. These lights are very bright and you should have no problem backing up even with some tint. They fit a little awkward in the taillight but that is expected since the bulbs are large. Overall great product that I recommend.

These backup lights are bright! It's amazing how much more light output is over the stock bulbs. I unfortunately had one of the bulbs go out on me. Even though my return date had already expired, I emailed the seller and their quick response and attention left me very satisfied.

Kudos to great customer service. Will definitely recommend these bulbs if you're hesitating to make a purchase.

This review is based on the 921 variant in the 2018 Honda Accord.

The promised brightness of 2100 lumens per bulb (!!!) just seemed insane enough to try it. I think they do deliver, but right next to (very bright) 1000 lumen turn lights, they seem similar in brightness (despite the amber color of the turn lights). It specifically says 2100 lumen per bulb (while some listings combine the light output of the set of two), so maybe the it's the measurement method? Further, be aware of a few things ...

While the 921 socket is the fit to the electrical contacts in the car, and in this case that is the right fit for the 2018 Honda Accord, it does not by itself guarantee that you can install these bulbs without problems since the shape is so different. Fundamentally, the rubber grommet instead of a socket allows these bulbs to fit a variety of cars, and the difference is in the cable extension that connects to car's socket. The latter becomes a connector since in its stead the bulb's grommet sits in the reflector. That's maybe not the most elegant solution but it's practical.

In my case (2018 Accord), the backup lights are located in the trunk lid and peeling the liner to the side is as easy as removing one pop rivet and folding it over. You could technically get by without removing the rivet, but Honda has a little surprise for the unsuspecting intruder. There is a plastic wall right next to the socket, which may be unique to the particular car. (See pictures) It may make perfect sense to protect the socket and cable, but for these unusual bulbs they pose a hurdle.

Part of the protective guard needs to be removed for the large heat sink of the bulb to fit and allow the rubber grommet to properly seat. It's not too diffult as the guard is plastic, but promised bright light will not come to fruition if you're not comfortable with making such modification.

Once there is enough room for the heat sink, the bulbs fit in any orientation and that's both questionable as well as advantageous. Questionable since there is no guarantee that the bulbs will be oriented properly, or that the chosen orientation is maintained. Advantageous may be that one can pick the most efficient orientation depending on the shape of your reflector. In the Accord is seemed to be beneficial to orient the bulbs as shown (picture).

Once installed, the bulbs are truly bright, but not instantly. The curious start-up phase takes a second or two to reach peak brightness. In a way it's similar to Xenon HID lights. Since it's roughly 2 seconds, it's not unbearable, but it does feel out of place for LEDs. It seemed intentional at first, but when you turn it off and back on with a few seconds between, it resumes with full brightness ... almost as if they had to warm up. Then again, it might help onlookers to "get used" to the brightness in normal use. The light itself is slightly blue but generally brilliant white. Typically that means improved night vision in addition to the "extreme" brightness.