Are these bulbs street legal?

In the USA, these LED bulbs are legal for fog light use only. They are not compliant with DOT / FMVSS108 and not street legal for headlights. Always check your local laws and regulations regarding aftermarket lighting.

How does the internal cooling fan work?

The SL2 Pro LED bulb features an integrated top-mounted fan sealed inside the housing. This design maximizes cooling efficiency and provides superior thermal management, ensuring long-term reliability without concerns about damage from dust or moisture.

What kind of warranty do these bulbs have?

These Diode Dynamics SL2 Pro LED bulbs are backed by a limited lifetime warranty. This covers defects in materials and workmanship, giving you peace of mind with your purchase.

Diode Dynamics H4 White SL2 Pro LED Bulbs (Pair)

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Diode Dynamics

Diode Dynamics H4 White SL2 Pro LED Bulbs (Pair)

Name: Diode Dynamics H4 White SL2 Pro LED Bulbs (Pair)
Brand: Diode Dynamics
Price: 255.95 USD
Availability: InStock

$255.95

Direct replacement H4 LED bulbs with improved output and internal cooling. Expect better focus and beam pattern than stock.

Key Features

TST LED Technology — industry-leading performance
Internal cooling fan — superior thermal management and long-term reliability
Fully integrated design — no external wires or drivers
Direct replacement bulb — compact fitment
Engineered to focus light — matches the original beam pattern
Backed by limited lifetime warranty

⚠️ 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