This collection includes LED 3rd brake lights (Centre High Mounted Stop Lamps – CHMSL) and T15 / 921 LED signal bulbs, designed to improve rear vehicle signalling visibility, cargo lighting utility, and brake reaction awareness. These lighting components integrate with 12V truck electrical systems and upgrade factory halogen systems using solid-state LED semiconductor technology, where light is generated through electroluminescence at a p-n junction rather than a heated filament.
CHMSL lighting systems are a safety-critical signalling component required on most vehicles manufactured after 1986, positioned higher than standard tail lights to ensure brake signals remain visible in traffic. LED upgrades provide instant illumination, higher brightness, and longer lifespan, typically 25,000–50,000 hours, significantly outperforming traditional halogen bulbs.
The collection combines vehicle-specific 3rd brake light assemblies for trucks and high-output T15 / 921 LED bulbs, covering both brake signalling and auxiliary rear lighting applications.
This category includes two primary automotive lighting product types:
- LED 3rd Brake Light Assemblies (CHMSL)
- T15 / 921 CANbus LED Signal & Reverse Bulbs
Both products serve the rear signalling and visibility system of trucks and passenger vehicles.
LED 3rd Brake Light Assemblies (CHMSL)
A 3rd brake light, also called a Centre High Mounted Stop Lamp (CHMSL), is a roof-mounted safety signalling light installed on the rear cab of trucks. This high-position brake signal improves rear visibility in traffic, making it easier for following drivers to detect braking.
Products in this category
- Dodge Ram LED 3rd Brake Lights (2009-2018) – Black/Smoke Lens
- Ford F150 LED 3rd Brake Lights (2009-2014) – Black Housing
Most modern CHMSL units use gasket-sealed waterproof housings, preventing water ingress into the cab or wiring system. Aftermarket models often feature smoked lenses, which provide a blackout appearance while maintaining the required red brake illumination.
Some truck CHMSL assemblies also integrate cargo bed lighting, combining red brake LEDs and white cargo LEDs into a dual-function lighting module.
T15 921 CANbus Projector LED Bulbs
The T15 / 921 LED bulb is a wedge-base automotive bulb standard commonly used in reverse lights, brake lights, and auxiliary signaling applications in 6000K white (reverse/cargo lighting). Projector-style LED bulbs include focused optical lenses, which help distribute light more evenly across the reflector housing. This improves beam intensity and visibility, especially for reverse lighting applications.
Installation & Compatibility Considerations
When installing LED CHMSL or T15 LED bulbs, several compatibility factors should be considered:
- Vehicle-specific fitment (Ford F150, Dodge Ram, Silverado, Tacoma, etc.)
- OEM connector compatibility for plug-and-play installation
- gasket sealing quality to prevent water leaks
- CANbus compatibility for modern vehicle electronics
Always verify vehicle year, make, and model compatibility before installing aftermarket lighting assemblies, or just use our Vehicle Search tool for easy verification.
