3156/3157: GTR i-LED Ultra Turn Signal Bulbs

The GTR Lighting Ultra i-LED isn't built to win the lumen numbers game—it's engineered to deliver superior real-world performance. Rather than relying on exaggerated specifications, GTR focused on advanced optical engineering to create an LED bulb that produces exceptional brightness, improved visibility, and a premium OEM-inspired appearance.

Once you experience the Ultra i-LED, you'll quickly understand why engineering matters more than numbers.

Advanced Ultra Optics

The Ultra i-LED features an innovative optical system specifically designed to maximize usable light output.

Instead of simply blasting light forward like conventional LED bulbs, the precision-engineered optics direct a significant portion of the light into your factory reflector. By reflecting more than half of the light output back into the housing, the Ultra i-LED creates dramatically improved brightness and visibility from a distance while maintaining impressive close-range illumination.

The result is a cleaner, brighter, and more effective lighting solution for virtually any application.

Intelligent i-Driver Technology

Every Ultra i-LED bulb incorporates GTR's advanced i-Driver electronics, engineered to maximize brightness without sacrificing reliability.

Upon activation, the bulb briefly operates at an increased power level for less than two seconds to deliver maximum initial intensity. It then automatically transitions to an optimized operating level that reduces heat while maintaining outstanding long-term performance and durability.

Resistor-Free Performance

Despite their impressive output, the Ultra i-LED bulbs consume nearly the same amount of power as traditional incandescent and halogen bulbs.

This allows them to operate without external load resistors in many applications, making installation simpler while reducing unnecessary heat.

For turn signal applications where hyperflash may occur, optional plug-and-play anti-hyperflash modules are recommended to ensure perfect operation.

Premium Appearance

Performance isn't the only thing that sets the Ultra i-LED apart.

Unlike many LED bulbs that expose their LED chips, the Ultra i-LED features crystal-clear optical lenses that completely conceal the emitters. Even when switched off, the bulbs provide a clean, high-end appearance thanks to their precision optics and anodized aluminum construction.

It's an OEM-quality look that complements any modern headlight or taillight.

Multiple Color Options

The GTR Ultra i-LED is available in several popular configurations to suit a wide variety of lighting applications:

• Pure White
• Red
• PC Amber
• White / Amber Switchback

Its universal collar design allows installation into most headlight and taillight housings, making it an excellent upgrade for:

• Turn Signals
• Brake Lights
• Tail Lights
• Daytime Running Lights (DRL)
• Parking Lights

Features

• Advanced Ultra Optics for maximum usable light output
• Reflector-enhancing optical design
• Intelligent i-Driver electronic control
• High-output startup boost
• Automatic thermal management
• Resistor-free operation in many applications
• Optional plug-and-play anti-hyperflash modules available
• Premium anodized aluminum housing
• Hidden LED chip design for a clean OEM appearance
• Available in White, Red, PC Amber & White/Amber Switchback
• Universal fitment for numerous automotive lighting applications

Technical Specifications

• Input Voltage: 9-24V DC
• Current: 260mA-2.1A (Red, White, Amber Models), 1.3A (Switchback Model) @ 12V DC
• Light Source: 9-12x Proprietary SMD

What's Included

• LED Bulbs: 2x (One Pair) GTR Ultra Indicator-LED Bulbs
• Wiring: 2x 3156/3157 Plug and Play Inputs
• Hardware: 4x Gaskets, 1x Torx Tool
• Optional Hyperflash Adapters: 2x
• Warranty: Lifetime Limited (Click for Details)

Compatibility

• Cross Compatibility: 3156, 3157, 3057, 3155, 3156, 3357, 3457, 4057, 4157
• FITMENT: Signal, Marker, Brake, Tail, Reverse Lights

Installation Guide

Product Video