How do I install these Diode Dynamics LED bulbs?

Installation is plug-and-play. Simply remove your factory bulb and plug the HP24 into the socket. The custom-molded base ensures a snug fit, just like the original 4257 bulb.

What is the light output of these bulbs?

The HP24 puts out 410 lumens, about double the light of your factory bulb. Diode Dynamics tests all their LEDs in-house to provide accurate, measured lumen figures.

What makes these bulbs more reliable than others on the market?

These bulbs are built with constant-current circuitry and transient suppression. This protects the LEDs from voltage spikes and ensures they last for years.

Diode Dynamics 4257 HP24 LED Bulb - Cool - White Switchback (Pair)

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Diode Dynamics

Diode Dynamics 4257 HP24 LED Bulb - Cool - White Switchback (Pair)

Name: Diode Dynamics 4257 HP24 LED Bulb - Cool - White Switchback (Pair)
Brand: Diode Dynamics
Price: 81.87 USD
Availability: InStock

$81.87

Adds a cool white running light and amber turn signal. Direct replacement for factory 4257 bulbs.

Key Features

True replacement — fits like the factory 4257 bulb
Switchback function — cool white running light plus amber turn signal
Samsung LEDs — strong light output
Aluminum casing — maximum heat dissipation
Non-polar and CK compatible — easy to install
Constant-current circuitry — long-lasting and reliable

⚠️ 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