Product Overview
Most dual-color watermelon lights rely on plastic lenses and scattered diode clusters that produce flat glow and inconsistent color separation. Purple is especially difficult to execute cleanly in those designs, often appearing washed out or uneven.
The Glass is Class Duo Gen 2 was engineered to solve that.
By pairing a real tempered-glass star lens with the precision-built AlphaFit Duo bulb, this system creates clean, high-contrast beam lines with zero center dark spot. Amber provides the traditional marker look, while purple delivers a deep, saturated secondary color that stands out instantly when activated.
This is not a novelty light — it’s a high-output optical system with real control.
Key Features & Benefits
Amber Primary / Purple Secondary Dual-Color Output
The AlphaFit Duo bulb uses two dedicated LED chip banks per side, one amber and one purple.
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Amber for classic marker or clearance lighting
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Purple for show, accent, or display use
When both color wires receive power, purple automatically overrides amber, ensuring clean color switching with no blending or flicker.
AlphaFit Duo 23-Watt LED Bulb – Gen 2 Architecture
At the heart of the system is the 23W AlphaFit Duo bulb, purpose-built for Glass is Class optics.
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Single-function per color (no dim/high cycling)
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Full-power output on both colors
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Optimized chip spacing for complete beam fill
Unlike the original hand-assembled Duo bulbs, the Gen 2 AlphaFit Duo is machine-manufactured with tighter tolerances and stricter QC, dramatically improving reliability and consistency.
Advanced Cooling & Moisture Management
The Gen 2 Duo uses the same proven thermal platform as the single-color AlphaFit:
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Oversized anodized aluminum body
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Internal active cooling fan
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Passive heat-sink structure beneath the LED chips
This hybrid system actively pulls heat away from the LEDs while creating positive internal pressure, allowing moisture to escape instead of being trapped inside the lamp.
Real Tempered-Glass Star Lens
Plastic lenses scatter light and mute color saturation. Glass doesn’t.
The Glass is Class tempered star lens:
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Produces long, sharp beam lines
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Preserves deep purple color without haze
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Resists yellowing, scratching, and heat distortion
The result is a beam pattern that looks crisp, aggressive, and unmistakably premium.
Simple 3-Wire Control – No Mandatory 3-Way Switch
The AlphaFit Duo uses a 3-wire configuration:
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Ground
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Primary color (amber)
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Secondary color (purple)
You can:
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Run amber on marker lights and trigger purple separately
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Use a 3-way switch if desired
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Or wire purple as a full-time override
Unlike some competitor systems, a 3-way switch is optional, not required.
Performance / Compatibility / Use-Case
The Amber/Purple Duo Gen 2 is ideal for:
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Show trucks wanting a bold secondary accent
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Custom builds that need standout color without sacrificing beam quality
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Interior, exterior, or under-glow style installations
Thanks to the small emission surface area and precision chip placement, the Duo Gen 2 produces a uniform beam with no dead center, outperforming common 17- and 19-diode dual-revolution lights.
Installation / Fitment / Technical Details
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Voltage: 12V & 24V compatible
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Power Draw: 23W (active color)
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Bulb Base: Custom AlphaFit Duo (H11-style fitment)
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Wiring: 3-wire (ground, amber, purple)
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Cooling: Active + passive hybrid system
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Lens: Tempered glass star pattern
Mounting brackets sold separately.
Build Quality / Warranty
The Gen 2 Glass is Class Duo represents a major upgrade over the original Duo line:
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Machine-built bulbs instead of hand-assembled
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Lower failure rates
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Improved thermal and moisture control
Warranty: 1-Year Limited Warranty
Designed and validated by Alpha Series Lighting for real-world truck environments.
⚠️ Not SAE/DOT compliant
These lights are intended for show, off-road, and auxiliary use only due to extreme brightness.
What’s Included
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(1) Glass is Class Duo Gen 2 Watermelon Light – Amber/Purple
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(1) Pre-installed AlphaFit Duo 23W LED bulb
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Integrated cooling system and venting
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Mounting bracket not included
Frequently Asked Questions
Will the purple color look washed out?
No. The AlphaFit Duo uses a dedicated purple LED bank and a glass lens that preserves color saturation, producing a deep, rich purple.
Does purple override amber automatically?
Yes. When both color wires are powered, purple overrides amber instantly.
Can I use this without a 3-way switch?
Yes. Many users wire amber to markers and trigger purple separately.
Is this the same bulb as the single-color AlphaFit?
It uses the same housing, cooling, and engineering — but adds dual LED chip banks for color switching.
Is this waterproof?
The system uses sealed glass and positive-pressure venting for moisture control. It is weather-resistant, not a cheap fully sealed plastic unit.
