31mm SMF2 LED (one)

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Availability: In stock

Ships today if ordered in the next 2 hours and 15 minutes!

31mm SMD2 Bulb is a direct replacement for any 29mm-33mm festoon halogen bulb.
  • Warm White
  • Cool White (6000K)
  • Red
  • Blue
  • Amber
  • Green
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31mm SMF2 LED (one)

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31mm 2-5050 SMD Bulb is a direct replacement for any 29mm-33mm festoon halogen bulb.

By changing the factory bulb to an LED, you can illuminate the area with a much brighter light, and add a pure white, luxury look.

The installation is 100% plug-and-play, just replace your factory bulb.



This bulb has two 5050-size SMDs. The bulb is made up of a 31mm sized base with glass tube for an OEM look, as well as high durability metal terminals. A load resistor is embedded to prevent blowing the LED from voltage surge, and a diode is implanted to protect the LED from reverse polarity. The LED is wired for 12V operation, the kind found on all vehicles.

Included in your order is ONE BULB.



These LEDs are available in crisp, bright colors including Cool White, Warm White, Blue, Red, Amber, and Green.

 We strongly recommend cool white or warm white for the best visibility.

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16 Lumens

Lumens: BUYER BEWARE! Most sellers just provide "calculated" lumen numbers, based on the maximum potential brightness of the LED chips on the bulb. For example, if a bulb has five 10-lumen chips, they will rate it at 50 lumens. However, this is not accurate, as the design of an LED bulb does not get rid of heat fast enough to run the LEDs at maximum.

These "calculated" lumen ratings are much, much higher than the true, measured light output, so it will look like competitors' bulbs are brighter than ours. This is because Diode Dynamics does not provide inflated "calculated" numbers; we believe it is misleading. We test the actual brightness of the bulbs in our lab, to provide real lumen output measurements. Our measurements are accurate, but they are usually much lower than the misleading "calculated" figures. Please click here to learn more about LED brightness measurement.



LED Components. Diode Dynamics uses only the highest quality LED chips in the production of its bulbs. This means we use only brand-name suppliers such as Epistar, Cree, Osram, and Samsung.

While our bulbs may look the same as others on the market, most copycat bulbs use economy-grade LED chips in order to reduce costs. This greatly reduces the reliability and overall brightness of the bulb when you compare it to Diode Dynamics.

Construction. Although LED technology allows for extremely long bulb life, the market is flooded with cheap LED bulbs that fail prematurely due to inferior construction. The worst enemy of LEDs is excessive heat, and when bulbs are not designed properly, they do not disperse heat as well, leading to premature failure.

Off-brand, cheap bulbs exhibit poor solder uniformity, high levels of flux in the solder, uneven chip placement, low-gauge terminal wires, poor assembly, and bulbs held together with inferior adhesives. At best, solder joints will crack and fail on low-quality LEDs after a few weeks of use. In the worst case, these bulbs can damage housings as the extra flux and adhesive evaporates and creates a residue on the lens of the housing.

Diode Dynamics bulbs are produced with modern, computerized equipment, and only the best materials, to ensure complete uniformity, high quality, and long bulb life.

All Diode Dynamics products come with a 30-day satisfaction guarantee and a 3-year limited replacement warranty. For more information, please view the FAQ guide.

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  1. Much better than SMF1 Review by Justin

    These bulbs are much better than the SMF1 bulb. The light is very useable and perfect for vanity lights. Would definitely recommend! Used in my 2013 Hyundai Elantra GT. (Posted on 3/27/16)

  2. Very bright Review by Jason

    Bought this for a 2004 Sequoia rear trunk light. This light lights up the rear cargo very well. Cannot go wrong with this buy. (Posted on 10/6/15)

  3. SMF2 - Great and bright! Review by Christopher

    I went with the SMF2 on my 2015 Impreza map lights.. Pretty bright, but I don't think it is much brighter than stock, just whiter. But it is perfect. I paired these with the SMF6 dome light, and that is a perfect balance. I would not want it any brighter. (Posted on 8/1/15)

  4. High quality trunk light Review by Jason

    High quality product at a reasonable price. Custom service is one the bests (Posted on 8/15/14)

  5. Great Quality Review by Nick

    I got this in blue for my dome light and its got a great color that fills the whole car. Its a great value. I installed it in my 03 Mazda Protege and it fit but just barley, Its slightly too big for the housing. (Posted on 1/31/14)

  6. Nice Review by tony nguyen

    Now my 2012 Chrysler 200 Interior had white leds but the mirrors had yellow light didn't match so I replaced them with white leds to match. It's really bright now my girlfriend can stop looking in the mirror with these bright leds lol (Posted on 8/22/13)

  7. Great, white LED Review by RJS

    I replaced my OEM dome light with this LED. It delivers a nice, clean WHITE light, rather than a tacky blue light that some LEDs emit. This looks to fall somewhere in the 5K range. I'm very happy with it and would highly recommend it. (Posted on 7/22/13)

  8. Look amazing! Review by Zachary

    Purchased these a few days ago and received them quickly! Immediately put inside my 08 Lancer and all I can say is "Wow!" These lights are bright and look amazing. (Posted on 5/23/13)

  9. Great, but could be better Review by Nathan

    The original festoon bulbs on my 4Runner were 28mm, so these were a tight fit. I have yet to see any 28mm LED festoons so I went with these. They look great at night. (Posted on 10/14/12)

  10. Great fit, great product Review by Roy

    The light from the LEDs are perfect. Illuminates the bottom of my doors very nicely and definitely bright. For the price the quality is beyond expectations! (Posted on 10/4/12)

  11. Looks great and bright! Review by Nathan

    I bought two of these for my map lights in my '11 Subaru Legacy and they certainly looked great. But at night once the lights come on in the cabin it's actually too bright so I'll probably downgrade to the 31mm 1-5050 SMD so the white light isn't so overpowering. (Posted on 9/28/12)

  12. Stage 3 LED Review by Kuldip

    I received these in my Stage 3 LED Kit. They make the cabin light up brighter and give that crisp led look. Great addition. (Posted on 9/5/12)

  13. Great dome light and in multipul colors!! Review by Ramal

    I got this one as a replacement for my dome light in my 94 toyota pickup. It was a little bit of a tight fit but it's a lot brighter and you can get it in different colors! (Posted on 8/14/12)

  14. Great for the map and dome lights Review by BG

    Put these in for the map lights and dome light on my 2011 Accord Coupe. Casts a much more soothing light than the stock halogens. Only issue I ran into was that one started flickering, then eventually went completely out. Contacted customer service, and not one, but two replacements were sent. I was so appreciative of this. No problems after that. Awesome to see the interior of the car light up in the night. (Posted on 6/22/12)

Worry-free warranty

  • - Full 3-year warranty on all products
  • - No waiting: we usually send new items out with a return label (US customers only)


You will get quick help from our trained staff for any issues.

All Off-Road Lighting also carry a limited lifetime warranty.

For further details, please see our full article.

Domestic (US) Customers

  • - Just $5 per order with our Diode Delivers program
  • - Same-day shipping for all orders placed by 12:00 PM CST (or until 4 PM with rush processing)
  • - USPS, for delivery in 2-4 days (on average)
  • - Express services are available, see exact pricing at checkout
  • - Fully Insured


International Customers

  • - We ship to all countries via standard mail
  • - Usually around $10 for LEDs, or $25 for HIDs.
  • - Choose your service on checkout to see exact prices:
  • - USPS 1st Class: 2-5 weeks
  • - USPS Priority: 1-2 weeks
  • - Express EMS: 1 week
  • - Please email us if you are unsure about shipping to your country.

You will receive updates from our site when your order is shipped, along with a unique shipment number to ensure that your order is correctly accounted for. This allows you to easily reply to us if you have any concerns.

Whether your order is big or small, it is tested through many run cycles, and each bulb is tested before shipment. Every single bulb. Every time. And if anything does go wrong, you can rely on our industry-leading warranty for worry-free replacement.

If you're not happy with your items, we want to make it right. So we have some pretty awesome return policies:


30 day return policy. All customers have 30 days from the date of original order shipment to return items.

Full refund, no fees. At Diode Dynamics, we offer free returns. That means no restocking fees, no administrative fees, and no hassle!

 Free return label. If your original order was over $50, you get a free return label for your items (US customers only). If your order was less than $50 or international, you can send the items back through your preferred method.


Within 30 days: If your original order was over $50, you can get new items shipped to you with a return label (US customers only). If your order was less than $50 or international, we can send you the new items first, but you are responsible for returning the old items.

Within 90 days: Any item can be returned for exchange or store credit within 90 days. The buyer is responsible for the cost of the return shipping, and must first return the old items. We'll still cover the postage for the new items.


Please note: due to the nature of custom acrylic pieces, we cannot offer any refund or exchange for returned custom acrylic items.


To make a return or exchange, please request an RMA, or give us a call. When we get it back, you will be notified and credited appropriately.

Again, all returns must be approved, with an RMA. This is so that we can process your return as quickly as possible when we get it. If you would like to return an item, please Request an RMA. Please include as much information as possible about the reason for return.

Alternatively, you can also send us a message, or give us a call!