Are these bulbs street legal?

In the USA, these LED bulbs are legal for fog light use only. They do not comply with DOT / FMVSS108 and are not street legal for headlights. Always check your local regulations, as international legality varies by country.

How does the internal fan stay clean?

The cooling fan is sealed inside the housing, which prevents damage from dust or moisture. This design maximizes cooling efficiency and ensures long-term reliability without requiring maintenance.

What is 'TST LED Technology?'

TST stands for thermal separation technology. TST LEDs are designed with electrical connections on the top, which lowers thermal resistance. This allows the SL2 Pro to run at higher power levels than traditional LED bulbs, while maintaining focus.

Diode Dynamics

Diode Dynamics H11/H8/H9 White SL2 Pro LED Bulbs (pair)

Name: Diode Dynamics H11/H8/H9 White SL2 Pro LED Bulbs (pair)
Brand: Diode Dynamics
Price: 276.43 USD
Availability: InStock

$276.43

Direct-fit LED replacement bulbs with improved light output and internal cooling. For fog light use only.

Key Features

TST LED Technology — allows higher power levels while maintaining focus
Direct replacement — simple plug-and-play installation
Internal cooling fan — maximizes cooling efficiency and reliability
Compact, wire-free design — fully integrated for clean install
Improved light output — brighter than the SL1 LED
Matches original beam pattern — engineered to focus light like your original bulb

⚠️ 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