I deliver newspapers for a "living." As such, I am constantly turning my car around in tight spaces in poorly-lit areas in the very early morning. My car is a 1999 Toyota Camry, and while its backup lights are acceptable with the original #921 incandescent bulbs, I needed and wanted better illumination, but did not want to alter the vehicle with add-on auxiliary lights. Changing over to LED was a no-brainer for me, but I have had some serious issues with LED bulbs I have purchased on Amazon before. (JTech, I'm calling you out here!)I had been placing an Amazon order for a few items, and needed to spend a little bit more to qualify for Free Shipping on the whole order. These particular bulbs appeared to have a better build quality than many of the bulbs on the market, and while I would have preferred a "Natural White" color temperature, I decided to add these to my cart. (One of the items ended up being canceled by Amazon itself after the order processed and the money was refunded, so when you factor in the savings in shipping, I actually came out ahead of the game.)The bulbs arrived, packaged in a sealed anti-static bag. Bonus points right off the bat! Taking a close, critical look at the circuit board, I couldn't find anything to nitpick. Solder joints were shiny and well-flowed, components laid out with reasonable spacing and the traces on the PCB were laid out well. The terminals that enter the bulb sockets are not the chintzy wire found on cheaper bulbs. Installation was a breeze, since these bulbs are the exact same physical size as the glass bulb it replaces, they will literally pop in and replace ANY #921 bulb with no problem. The manufacturer spent the time to engineer the bulb properly so it is not dependent on polarity (it works no matter which way you plug it in)!I didn't want to write a review until I had some time to use these bulbs daily and report their daily repetitive on-off performance over long-term use (just over 6 months in Jan. 2019). I can very happily report that both bulbs have worked flawlessly and have not appeared to suffer any degradation in brightness, despite being used maybe 4x more than the average driver would use them every day. This seems to verify the claim that the bulbs have a constant-current driver and would suggest they are not being pushed to the maximum current levels that other brands are guilty of (which leads to longer lifespan). They are indeed brighter than factory and, once I adjusted to the way certain colors react to the cool-white illumination, I find I can see a great deal better than with the stock bulbs. They also have withstood the vibration abuse of a modest subwoofer setup and crappy CT roads. If you are looking to upgrade your backup lights and don't mind the cool white, I can highly recommend these bulbs. I am VERY happy with my purchase!

These Are BRIGHT. Would totally purchase these again

Very impressed with the quality and brightness of the bulbs! Bought them for my excursion and they are very bright. Well worth the purchase for reverse lights!

On older vehicles, you most likely will create hyperplasia, easily fixable. Lights are bright and clear.

Works good and it’s bright enough. Plug and play. I used a relay so didn’t use the canbus it came with. Works good so far. Nice looking bulb.

The issue I found with these is that they don't draw quite enough power to avoid a fast blink in my truck. I guess I could replace the relay, but I think I will replace with incandescent bulbs. Out of principle that is annoying so am holding off for now. I would not recommend buying these I think. Not seeing the value based on my experience.

These light bulbs hyper flashed my jeep wrangler jk rear turn lights.

Very bright, white LED lighting. Non-flicker as well. Well worth it. Used them for the interior of my car.

I contacted the seller for the compatibility of their H11 LED headlight and 921 LED reverse light for 2015 Mazda CX-5, and received a confirmation reply quickly. So I placed an order and got it in just few days as usual on Amazon.Installation of the 921 LED reverse light on a 2015 Mazda CX-5 was simple and straightforward. It’s done in about 5 minutes, showing no flicking and no error message on dashboard.Compare to original manufacturer’s stock halogen bulbs, 921 LED backup light output brighter and white light, although I was expecting something a little brighter.Sealite 921 LED reverse light offer an easy upgrade for 2015 Mazda CX-5, and the seller provides excellent communication and customer service.Highly recommended!

These are fabulous. The led bulbs are bright and easy installation. The only reason I had to repurchase (the last ones were over 5 years ago) was because my taillight cracked and water saturated right through. I had to replace it and couldn't use the bulb old bulb. I'm sure they would have lasted forever if I did need to replace the taillight.

They are bright and better than factory. I'm happy with the purchase. Now just need to see how long they last.

Although the delivery date was a day late because of the laziness of the Intelcom Express delivery company, the product itself is good value for the money and everything works fine. Will recommend this product to my friends and family.