28mm SMF1 LED (one)

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Availability: In stock

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28mm SMF1 Bulb is a direct replacement for any 28mm festoon halogen bulb. Usually, these are used in the vanity mirror lights of many vehicles.
  • Warm White
  • Cool White (6000K)
  • Red
  • Blue
  • Amber
  • Green
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28mm SMF1 LED (one)

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28mm SMF1 Bulb is a direct replacement for any 28mm festoon halogen bulb. Usually, these are used in the vanity mirror lights of many vehicles.

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 one 5050-size SMD. The bulb is made up of a 28mm sized base 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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8 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. For Vanity Light on 2013 Ford Focus ST Review by Sid

    After trying a couple of different eBay LEDs from China, I wasn't happy with the brightness or color temperature (they were too bluish/purple). In the end, I'm very glad I went with the SMF1. The brightness is perfect for my application, it is slightly brighter than stock but not so bright that it's blinding since my vanity lights face directly at me. The 6000k cool white looks completely white with no noticeable bluish tint to it. (Posted on 2/2/16)

  2. Look good Review by redjerry

    These look so mich crisper in the vanity lights in the sun viser. (Posted on 2/20/15)

  3. WOW What a difference Review by Curmudgeon

    Replaced the factory vanity lights with these. What a difference. I did not want the vanity light too bright so I went with the single LED version and these are as bright or a little brighter than factory. the biggest wow is the color - nice white light no more yellow. A must do upgrade - your wife/girlfriend will love you for it. (Posted on 9/3/14)

  4. Vanity Mirror Light Review by Peter

    These were a great upgrade to my vanity mirror lights in my sun visors. Not too bright to blind anyone but brighter than the OEM light. Plus these LED's don't get hot like the OEM halogen bulbs. (Posted on 7/2/14)

  5. Looks Great! Review by Domenic

    After trying to fit 31 mm festoon bulbs into my 2013 Altima visors with no luck, I noticed a picture of the 28mm festoon bulbs in a 2013 Altima visor so I picked up a pair and they are great!. They fit perfectly and are much brighter then the stock amber bulb. They are bright white and it doesn't seem to have any blue hue to it unfortunately, but still looks and works great! (Posted on 5/8/13)

  6. Worth it to replace stock bulbs Review by Nathan

    I bought 4 of these to put in my vanity lights in my '11 Subaru Legacy and they are beautiful. They are pretty damn bright and can certainly be a little dangerous if you open your vanity mirror while driving at night. (Posted on 9/28/12)

  7. Great vanity mirror bulbs Review by BG

    Put these in the vanity mirrors on my 2011 Accord Coupe. The lights are so much brighter than stock and are more than enough to light up the whole side of the car with the mirror opened. No need to go up to the 2 smd ones as these are quite substantial. Great price, awesome product. (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!