Diode Dynamics 28mm SMF1 LED Bulbs
Warranty Information
Vendor warranty summary
Diode Dynamics Warranty
At a glance: 3 years on every Diode Dynamics product, 8 years on Stage Series and Elite Series lamps, and lifetime coverage on Stage Series pods, rock lights, SL2 bulbs and off-road brackets (orders from April 15, 2025)
This is Diode Dynamics' policy, not an NVMOS policy. We've summarized Diode Dynamics' published warranty in plain English. The manufacturer's official terms always govern and can change without notice. Last reviewed on nvmos.com: October 15, 2026.
Coverage by product
| Product or component | Coverage |
|---|---|
| All Diode Dynamics products: defects in materials and workmanship | 3 years |
| Stage Series and Elite Series lamp assemblies and lamp mounting brackets (functional failure; wiring, harnesses and lens covers excluded after year 3) | 8 years |
| Stage Series LED pods, Stage Series rock lights, SL2 and SL2 Pro LED bulbs, off-road mounting brackets, ordered on or after April 15, 2025 (functional failure after year 3) | Lifetime |
| Commercial or industrial use (construction, mining, fleet, agriculture and similar) | Capped at 8 years |
| Form Lighting products (a Diode Dynamics brand) | 2 years (details) |
What's covered
- Defective products are replaced with the same item, or a comparable one if it's been discontinued
- Diode Dynamics may replace just the failed component
- Finish defects caused by manufacturing, during the first 3 years
- Moisture beyond normal condensation that points to a seal failure, at Diode Dynamics' discretion
- Free tech support for the life of the product, even after the warranty ends
What's not covered
- Normal condensation, and paint or coating wear from regular use
- Installation or labor costs
- Improper installation or use, abuse, or opening, rewiring or repairing a product
- Swapping lenses on Stage Series lights voids the 3-year coverage (the 8-year coverage stays)
- Purchases from unauthorized sellers; coverage is for the original buyer and isn't transferable
How to make a Diode Dynamics claim
- Keep your proof of purchase; every claim needs it (gift recipients can register within 90 days of the original purchase instead)
- Request an RMA through Diode Dynamics' returns portal and work through diagnosis with their support team
- Nothing goes back without an RMA number; include photos for moisture claims
- For US customers, Diode Dynamics covers shipping on 3-year claims, plus return shipping for inspection on 8-year and lifetime claims
Diode Dynamics contact: Phone: (314) 205-3033 · Contact form · Monday to Friday, 10 AM to 5 PM Central · St. Charles, Missouri
Bought it from NVMOS? Start with us.
Have your order number and a few photos of the issue ready, then call real humans at (920) 249-7744 or send us a message. We'll tell you whether the claim goes through us or straight to Diode Dynamics, and help it along either way.
Disclaimer: The information on this page describes Diode Dynamics' own warranty policy. It is not a warranty offered by NVMOS (No Visible Means of Support LLC). Manufacturers update their terms at any time; we review these pages periodically, but the manufacturer's current official policy is the one that applies to your claim. Source: Diode Dynamics warranty. Last updated on nvmos.com: October 15, 2026. See our return policy for NVMOS's own terms.
About the brand
Diode Dynamics builds LED lighting in St. Charles, Missouri: Stage Series SS3 and SS5 pods, CrossLink light bars, ditch and fog kits, bulbs and accents. It designs, engineers and assembles as much as it can in the USA instead of rebranding imports, which shows in the warranty. NVMOS carries the Diode Dynamics off-road, vehicle lamp, bulb and accent lines for Toyota, Jeep, Ford, GM, Ram and Nissan trucks and SUVs,...
Based in: St. Charles, Missouri · Founded: 2006 · Made in: Designed and assembled in the USA · Quality: ISO 9001:2015 certified · Lead time: In-stock items usually leave Diode Dynamics the same business day; ask us about any item
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Warranty terms are set by Diode Dynamics, not NVMOS, and can change. Bought from us? Call (920) 249-7744 and we'll handle the claim with the brand.
Diode Dynamics 28mm SMF1 LED bulbs are a direct, plug-and-play replacement for the factory 28mm festoon bulb (vanity mirror light), giving you an LED look at 16 measured lumens per bulb. Diode Dynamics lists them for trucks and SUVs including the Toyota 4Runner.
Why it works
- Swaps the yellowed incandescent glow for a sharper, more modern LED look.
- Plug and play — no modification needed.
- Polarity specific: if it stays dark after install, rotate it 180° in the socket.
Options
Available in Green, Warm White (3000K), Red, Cool White (6000K), Blue and Amber, sold as a single or a pair. Whites are the usual pick for interior and utility lights; the colors are for custom accent lighting.
Fitment
Diode Dynamics lists this for:
- Toyota 4Runner 2003-2009
Specs at a glance
- Measured output: 16 lm
- Beam: omnidirectional (270 degrees)
- Power: 0.18 W
- Current: 0.014 A at 13.2V
- Operating voltage: 9-16V
- Polarity: polarity specific
- Operating temperature: -40°F to 185°F
- Bulb size: 28mm Fuse
Warranty
Diode Dynamics backs the 28mm SMF1 LED bulbs with a 3-year replacement limited warranty. Full terms are on our Diode Dynamics warranty page, and the rest of the brand lives in our Diode Dynamics lineup.
Questions before you order?
Fitment questions are easier to settle before the box ships. Call or text Carl & Anton at (920) 249-7744 or use the chat — real humans in Sheboygan, Wisconsin, not a call center.
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Specifications
Diode Dynamics 28mm SMF1 LED Bulbs FAQs
Will these fit my truck?
Diode Dynamics lists them for vehicles including the Toyota 4Runner. Call or text the real humans at NVMOS, (920) 249-7744.
Do I need to modify anything?
No. They are a direct replacement for the 28mm festoon bulb and plug straight into the factory socket.
I installed it and it does not light. Now what?
These are polarity specific. Pull the bulb, rotate it 180 degrees in the socket and try again.
Single or pair?
Both are listed. Most housings that come in left and right sides want a pair; a single makes sense for a lone dome, cargo or trunk light.
Multi-column
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