OXILAM7507 PY21W BAU15S LED Bulbs Amber Yellow 2800LM for Turn Signal Lights with Build-in Load Resistor CANBUS Error Free 2641A 12496 7507AST Bulb Replacement (2PCS)ClimatePartner certified

I bought this LED bulb set for my 2009 Mercedes-Benz CLK 350 rear turn signals, and I'm happy to report that they work perfectly without triggering any CANBUS errors. If you own a Mercedes, you know how picky these cars can be with aftermarket bulbs, but this product did not disappoint.Installation was straightforward, and the bulbs are bright, crisp, and a significant upgrade over the factory halogens. They give a clean amber light that looks modern. I’ve had them installed for a few weeks now with no flickering, no dashboard warnings, and no issues with fit.Highly recommend if you're looking for a plug-and-play LED upgrade that won’t trip the CANBUS system on older European models like mine.

These OXILAM 7507/PY21W LED bulbs are absolutely fantastic and exactly what I was looking for! They are incredibly bright – the 2800LM output makes a HUGE difference compared to the dim factory incandescent bulbs. My turn signals are now significantly more visible both day and night, which adds a nice safety element. The amber yellow color is sharp and clear.Installation was simple plug-and-play, fitting perfectly into the BAU15S socket. The absolute best part is the built-in load resistor – truly CANBUS error-free! I experienced ZERO hyperflash and no annoying warning lights on my dashboard, which was my main concern when switching to LED signals. These bulbs just worked perfectly right out of the box.The instant on/off of the LEDs also looks much cleaner and more modern than the slow glow of the old bulbs. If you want a major upgrade in brightness and visibility for your turn signals without any hyperflash or error code headaches, these OXILAM bulbs are the perfect solution. Highly recommended!

Edit: I got a chance to install the bulbs in my wife's car and they work as advertised. I can't tell if it's because the load circuit built into the bulb just happens to be sufficient for her car and the included load resistors would still be necessary for other vehicles, but they definitely do include a load circuit and driver in the bulb. (It was raining and I didn't have the ability to put them thru exhaustive tests with meters, plus I don't know what resistance the car looks for.)The bulbs are super bright and have a color temperature that's easier for the human eye to see than the OEM amber halogen bulbs. No one's going to miss it when my wife changes lanes or makes a turn. The instant on/off of the LED vs the fade in/out of the halogens is very eye-catching and, along with the added brightness, should increase visibility especially on bright days.I suspect that there's a holdover in the packaging method that put the unneeded resistors into the packaging. They may have originally shipped with non-CANBUS bulbs and were just packed in by mistake. (I guess I've got two extra load resistors and heat sinks hanging around for future projects now, because these aren't going back.)Review adjusted to 5 stars. While there was some initial confusion that could have been easily avoided, the product works as expected and advertised. Well worth the price and easy to install in the car I'm working with (2013 Hyundai Genesis Coupe).See Edit. For now I'm giving these a 2 star review based on the difference between the ad and the package. These arrived today and, full disclosure, I haven't installed them yet. The ad lists that there's a built in load circuit, but yet these still come with load resistors in the box and instructions for how to install them.That the resistors are included rather than sold separately is nice, however, the point of CANBUS bulbs is to not produce errors and avoid cutting into the wiring with load resistors (as well as avoiding the minor hassle of positioning the resistors to dissipate heat). These were advertised to not need resistors at all. At this point I can only assume that either the bulbs don't have built in load circuits as advertised, they're potentially underpowered and will only avoid errors and hyperflashing on some cars, necessitating the use of additional resistors to compensate, or I somehow got the wrong item. Nowhere in the ad is it mentioned that anything other than the bulbs themselves are included, so seeing load resistors in the box was an unpleasant surprise.I'll be installing one bulb tomorrow to see if it produces an error or hyperflashing. I'll update my review accordingly. If the resistors are required to make these truly error free, I'll be returning them as they're for my wife's car and I'm not willing to cut into her wiring when I know there are bulbs that don't require it (I have several in my own vehicle and two in her front signals, but I didn't want to use switchbacks that might blind drivers behind her or appear to be reverse lights while they're not flashing).Hopefully this is an oversight, or mistake, but I wanted to give fair warning to anyone who considers purchasing these before I can determine the reality of the situation. I'll update when I have more information.

These Red 7443/7440 Taillight Turn Signal LEDs are not bad for the price, decently bright, but I'm not convinced they are 4000 Lumens when blinker is activated...Probably more like 2000lm or less at 800~1200lm each bulb. Which still isn't too bad, as most on market are even less than this.Unfortunately I still experienced the Rapid Flash with them on my 04-08 Gen 3 Acura TL an they are suppose to have a built-in Resistor for error free plug & play set it and forget it, no needed Resistors to buy! So, UNLESS you ALREADY have a pair of 50Watt 6 Ohm Resistors laying around... Don't even bother cause you'll spend another $10-$25 on some good Resistors anyways. Instead take that money and spend it on some GTR Carbide 2.0 built in Resistor LEDs. For basically the same price and no messing with finding a spot to mount the Resistors (the FRONT is very problematic with finding high enough space away from puddles and water to mount Resistors with 3M Double Sided Tape/screws, as they reach up to 300° and can melt your headlight and other lighting etc, wiring harnesses! The better ones are the ones that only get half that temperature of 150~200°)...Anyhow the Rears in trunk quarter panels are much easier to mount Resistors with the double sided 3M tape.Lastly when I went to remove the bulb from the socket the Black bottom part of the body of the LED separated from the Silver top! Wasn't to happy as they need to not skimp on some proper bonding adhesive glue... I don't know why that happened but if these were truly 4000 lumens and had a better built-in Resistor, and glue used in assembling the Body then thread would be very good, so far they are just decent, but didn't impress me all too well... I should give 3.5 stars because of the Resistors not doing their Job like they are supposed to do, and the separation of the body when trying to remove from socket, but I gave the benefit of the doubt with 4 Stars Just because they are a tad brighter than most probably on the market.There is room for improvement even if it cost literally $2-$5 more for the set it would be worth spending $25 then if it fixed the 2 issues.