OSRAM LEDriving® SL, ≜ P21/5W, Red, LED signal lamps, Off-road only, non ECE, Double Blister

They have a similar brightness level to standard halogen bulbs while looking more modern, and should hopefully last much longer. One minor issue though is that they didn't work at first, until I used a screwdriver to bend the metal contacts in the bulb holder to make a better connection. They've worked flawlessly since. My car doesn't have CANBUS detection so I don't have to worry about that, but looking at other reviews it seems they would trigger errors if it did.

Same size as the bulbs it replace a 1000% brighter.

The Osram W21/5W LED bulbs are excellent! They provide bright and clear light, significantly improving visibility. Easy to install, energy-efficient, and long-lasting, they’re a perfect upgrade from standard bulbs. Highly recommended for anyone looking to enhance their car’s lighting.

I'm at a loss to understand how these can be quite so bad. I have bought a lot of Osram bulbs and they're generally great quality. Something seriously amiss with these ones however. The 5W "tail" performance is shown in the photos. You'll see I took the bulbs out of the fitting for one photo as when in the fitting it looked like it's not actually lit.The comparison pic shows the normal incandescents on the left and the LEDs on the right. These were taken on the same manual camera settings. Both are much brighter than in reality. I could have adjusted to look more like reality, but I didn't want to alter the photos. So although the incandescents look just a bit brighter, in practice the difference is much greater as shown by the shot with one of each bulb type in the same light fitting (incandescent left, LED right).The other issue is that the 21W circuit (i.e. the "stop"/brake light part) was very intermittent. This was due to the bulb base being slimmer than a standard incandescent. They're basicaly a bit loose in the fitting and the brake light circuit contact was not intermittent. It might be possible (although not easy) to bend out the bulb holder contacts a bitto make them a more snug fit, but I didn't want to risk breaking the bulb holders and it shouldn't be necessary.They may be OK in some applications and it's possible other bulb holders might suit them better, but I can't recommend for a stop and tail light. I was looking for a brighter light and faster reaction for the brake light. While it does light faster (when I can get it to light at all), both the tail light and the brake light are dimmer than incandescents and so plain dangerous.

The OSRAM LEDriving SL LED Signal Lamps offer a powerful and reliable lighting solution for off-road enthusiasts looking to enhance their vehicle's visibility and style.Replacing conventional T4W lamps, these LED signal lamps emit a crisp white light with a color temperature of 6000K, providing a modern and sleek appearance to any off-road vehicle. Whether you're navigating through rugged terrain or exploring remote trails, these LED lamps ensure optimum visibility, allowing you to stand out while driving off-road.One of the key advantages of the OSRAM LEDriving SL LED Signal Lamps is their easy plug-and-play installation. With no complicated wiring or modifications required, upgrading to LED technology is quick and effortless. Simply remove your old T4W lamps and replace them with these LED signal lamps for instant illumination enhancement.Furthermore, these LED lamps boast OSRAM's renowned quality and reliability, meaning you can trust them to deliver consistent performance in demanding off-road conditions. With fewer lamp replacements needed, you can focus on enjoying your off-road adventures without worrying about lighting failures or malfunctions.It's important to note that these products are designed for off-road use only and do not have ECE approval for use on public roads. This restriction ensures compliance with regulations and safety standards, making them suitable for off-road enthusiasts who prioritize performance and style in their vehicles.In summary, the OSRAM LEDriving SL LED Signal Lamps offer a convenient and high-quality lighting solution for off-road vehicles. With their easy installation, superior visibility, and durable construction, these LED lamps are an excellent choice for enhancing your off-road driving experience.

In a sea of Chinese LED bulbs, all with terrible reviews and claims of error-free operation, I finally found these Osram 508 w21/5w wedge LEDs.They're exactly what I was looking for, none of this "SUPER BRIGHT" malarkey. They're as bright as the bulbs they replaced which means they likely comply with ECE regulations. The illumination is white in colour (I'd say around 6500k) rather than yellowish (3500k).Image on the right is the Halfords "3500k whiter" bulbs which are a halogen bulb with a blue coating. As you can see, they are very yellow compared to the left image which is the Osram "W3x16q", "W21/5W" LED I'm reviewing.Works & looks great as a DRL/Front position upgrade on my Vauxhall Corsa D (2012).Thanks Osram, thanks Amazon!

Took a chance on these as nowhere in sales description is canbus mentioned... but pleasantly surprised to see on back of packaging it says Canbus compatible... and they are.. well for a Volvo C30 anyway. The bulbs are very nice. Not too bright (photo exaggerates effect) and a classy upgrade thats looks pretty much OEM. So pleased with these am now going to try the Osram 21w led version for my reversing lights which need an upgrade. Hoping they last as long as Osram say.

Technically perfect, CANBUS compatible so no errors on dash. However not greatest for my use scenario - I have used them for wing mirror indicators in Volvo V70 III and it is not the brightest I have to say.Light looks more focused and not dissolved through reflective surfaces of the indicator, which kinda makes sense with them being LED.