The GTR 921/T15 Ultra LED reverse bulbs are built for drivers who want brighter backup light output without replacing the full taillight assembly. This Gen Two Ultra version increases output, adds more LED chips, and improves thermal performance compared to the earlier GTR reverse bulb design.
Features include:
- 921/T15 LED reverse bulb fitment
- 1,200 raw lumens per bulb
- 15 CSP 1919 LEDs per bulb
- 6000K cool white output
- 12W power rating
- 9-24V DC input range
- Anodized aluminum construction
- Projector lens on top edge
- Light output from all four sides
- Sold as a pair
- 2-year warranty
Key Features & Benefits
High-Output Reverse Light Performance
These GTR Ultra LED reverse bulbs are designed to improve visibility when backing up at night.
Features include:
- 1,200 raw lumens per bulb
- 2,400 raw lumens total per pair
- 6000K cool white output
- 15 CSP 1919 LED chips per bulb
- Designed for reverse light use
This gives your backup lights a stronger, cleaner output compared to typical incandescent reverse bulbs.
Gen Two Ultra Series Design
The Gen Two Ultra version improves on the original GTR reverse bulb platform.
Features include:
- Increased output compared to previous generation
- 15 LED chips per bulb
- Updated thermal design
- Improved heat-sink capability
- Built for longer, more reliable operation
The upgraded design helps the bulbs run cooler while delivering stronger reverse light performance.
Four-Sided Illumination With Projector Lens
These bulbs are designed to perform in different reflector housing layouts.
Features include:
- Light output from all four sides
- Projector lens on the top edge
- Reflector-friendly output design
- Works with side-entry or rear-entry bulb positions
- Helps maximize usable light from the housing
This design helps improve light distribution in a wider range of reverse light housings.
921/T15 Reverse Light Upgrade
The GTR Ultra Series LED bulbs are intended for reverse light applications using compatible 921/T15 bulb fitment.
Features include:
- 921/T15 bulb style
- Reverse light application
- Pair of bulbs included
- Plug-in upgrade design
- Universal-style reverse bulb replacement
Confirm your vehicle’s bulb size before ordering.
Performance, Compatibility & Use Case
Reverse Light Compatibility
These GTR Lighting Ultra Series LED bulbs are intended for reverse light use.
Important fitment notes:
- Bulb style: 921/T15
- Intended use: Reverse lights
- Input voltage: 9-24V DC
- Polarity: Not specified in supplied product information
Always confirm your factory bulb size, socket style, housing clearance, and electrical compatibility before ordering.
Application & Use Case
Designed for:
- Reverse light upgrades
- Backup light replacement
- Cars, trucks, SUVs, and off-road vehicles with compatible 921/T15 reverse sockets
- Improved rearward visibility
- 6000K cool white backup lighting
- Drivers who want brighter reverse lights without replacing the full housing
These bulbs are a simple upgrade for vehicles with weak factory reverse lights.
Installation & Technical Details
Installation Overview
These bulbs are designed as a plug-in reverse light upgrade for compatible 921/T15 applications.
Installation details:
- Product type: LED reverse light bulb pair
- Bulb style: 921/T15
- LED count: 15 CSP 1919 LEDs per bulb
- Output: 1,200 raw lumens each
- Color temperature: 6000K
- Power: 12W
- Input voltage: 9-24V DC
- Material: Anodized aluminum
- Intended use: Reverse lights
Basic installation steps:
- Remove the factory reverse light bulb socket from the tail light
- Remove the old incandescent bulb
- Install the GTR Ultra LED reverse bulb into the socket
- Seat the bulb and grommet properly in the reverse light housing
- Test function before reassembly
Professional installation is recommended if access to the reverse light housing is difficult.
Build Quality, Materials & Warranty
Build Quality
The GTR Ultra reverse bulbs are built with upgraded LED and heat management design.
Key details:
- Anodized aluminum body
- 15 CSP 1919 LEDs
- Projector lens design
- Four-sided illumination
- Improved base heat sink
- 6000K LED output
- Reverse light-specific application
Warranty Coverage
This product includes a 2-year warranty.
What’s Included
Included:
- 2 × GTR Ultra Series 921/T15 LED Reverse Light Bulbs
Frequently Asked Questions About GTR 921/T15 Ultra LED Reverse Bulbs
What are these bulbs used for?
These bulbs are intended for reverse light applications.
They are designed to replace compatible 921/T15 reverse light bulbs.
How bright are these reverse bulbs?
Each bulb is rated at 1,200 raw lumens.
The pair provides 2,400 raw lumens total.
What color is the light output?
These bulbs produce 6000K cool white light.
This gives the reverse lights a clean, modern white output.
Are these sold as a pair?
Yes. This kit includes two GTR Ultra LED reverse light bulbs.
That gives you one pair for left and right reverse light applications where compatible.
What voltage do these bulbs support?
These bulbs support 9-24V DC input.
Confirm your vehicle’s electrical system and socket compatibility before installation.
What LEDs do these bulbs use?
Each bulb uses 15 CSP 1919 LEDs.
The design also includes a projector lens on the top edge and illumination from all four sides.
Are these plug-and-play?
They are designed as a simple bulb replacement for compatible 921/T15 reverse light sockets.
Fitment can vary by vehicle, socket design, housing depth, and wiring.
Will these fit my vehicle?
They fit vehicles that use compatible 921/T15 reverse light bulbs.
Check your owner’s manual, existing bulb number, or contact us to confirm fitment before ordering.
Do these bulbs include resistors?
Resistors are not listed in the supplied product information.
If your vehicle has bulb-out warnings or CANbus sensitivity, additional components may be required.
