How bright are these LED bulbs?

The SMF1 LED provides 16 lumens of measured output, similar to your original 28mm bulb. If you're looking for more brightness, Diode Dynamics recommends their SMF2 option.

What is a 'festoon' bulb?

A festoon bulb is a type of automotive bulb that is cylindrical in shape with metal caps on both ends. They are commonly used in interior lighting applications such as vanity mirrors, dome lights, and map lights.

How long will these bulbs last?

These bulbs are built with constant-current circuitry and transient suppression, which means they will last for years, not months, with no flickering or failure. They are also backed by a three-year replacement warranty from Diode Dynamics.

Diode Dynamics 28mm SMF1 LED Bulb Warm - White Set of 4

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Diode Dynamics

Diode Dynamics 28mm SMF1 LED Bulb Warm - White Set of 4

Name: Diode Dynamics 28mm SMF1 LED Bulb Warm - White Set of 4
Brand: Diode Dynamics
Price: 16.33 USD
Availability: InStock

$16.33

Modernize your vehicle's lighting with this direct-fit LED bulb. Simple plug-and-play installation.

Key Features

Direct replacement — fits factory 28mm festoon bulb sockets
Modern look — adds updated LED appearance
Simple install — plug and play
Long-lasting — constant-current circuitry prevents flickering and failure
3000K warm white color — matches traditional bulb color
Durable construction — metal terminals and light weight prevent vibration

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

Will this fit your vehicle?

Compatible with 193 vehicles

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Product Details

The 28mm SMF1 LED bulb is a direct replacement for any 28mm-size bulb commonly found in vanity mirror lights in many vehicles. The SMF1 upgrades the factory yellowish incandescent bulb to a more modern LED appearance.