Product Overview
Red/purple is one of the hardest dual-color combinations to execute correctly. Most competitors rely on plastic lenses and scattered diode clusters, resulting in washed-out purple tones, uneven beams, and visible center dead spots.
The Glass is Class Duo Gen 2 was engineered to eliminate those issues entirely.
By pairing a real tempered-glass star lens with the AlphaFit Duo bulb’s dual-bank LED architecture, this system produces long, sharply defined beam lines with zero center dark void. Red delivers bold primary illumination, while purple provides a deep, saturated secondary that instantly sets your build apart.
This is not glow lighting — it’s precision optics.
Key Features & Benefits
Red Primary / Purple Secondary Dual-Color Output
The AlphaFit Duo bulb uses two dedicated LED chip banks per side, one red and one purple.
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Red for primary marker, accent, or rear-facing illumination
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Purple for show, accent, or custom display lighting
When both color wires receive power, purple automatically overrides red, ensuring clean switching with no flicker or color blending.
AlphaFit Duo 23-Watt LED Bulb – Gen 2 Platform
At the core 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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Extremely small emission surface area for complete beam fill
Unlike the original hand-assembled Duo bulbs, the Gen 2 AlphaFit Duo is machine-manufactured with tight tolerances and strict QC, delivering superior consistency and long-term reliability.
Advanced Cooling & Moisture Management
The Gen 2 Duo uses the same proven thermal architecture as the Gen 2 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 directly beneath the LED chips
This hybrid system actively pulls heat away from the LEDs while creating positive internal pressure, allowing condensation to vent out naturally instead of being trapped inside the housing.
Real Tempered-Glass Star Lens
Plastic lenses scatter light and mute purple output. Glass preserves it.
The Glass is Class tempered star lens:
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Produces long, crisp beam lines
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Preserves deep purple saturation without haze
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Resists yellowing, scratching, and heat distortion
The result is a beam pattern that looks sharp, aggressive, and unmistakably premium.
Simple 3-Wire Control – No Mandatory 3-Way Switch
The AlphaFit Duo uses a simple 3-wire configuration:
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Ground
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Primary color (red)
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Secondary color (purple)
You can:
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Run red full-time 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 many competitor systems, a 3-way switch is optional, not required.
Performance / Compatibility / Use-Case
The Red/Purple Duo Gen 2 is ideal for:
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Show trucks looking for a unique, high-contrast color combo
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Custom builds where purple is used for branding or theme lighting
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Interior, exterior, or accent installations
Thanks to tight LED chip spacing and a minimal emission surface area, the Duo Gen 2 produces a uniform, fully filled beam with no center dead spot, outperforming common 17- and 19-diode dual-revolution designs.
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, red, 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 evolution over the original Duo line:
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Machine-built bulbs instead of hand-assembled
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Much tighter manufacturing tolerances
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Significantly lower failure rates
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Improved heat 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 – Red/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
Is the purple color deep or washed out?
The purple output is deep, saturated, and sharply defined thanks to a dedicated purple LED bank and real glass optics.
Does purple override red automatically?
Yes. When both color wires are powered, purple overrides red instantly.
Can I run red as my main color and purple only when triggered?
Yes. This is one of the most common wiring setups for this color combo.
Is this the same bulb as the single-color AlphaFit?
It uses the same housing, cooling system, and engineering — but adds dual LED chip banks for dual-color control.
Is this waterproof?
The glass lens is sealed, and the bulb uses positive-pressure venting. It is weather-resistant and moisture-managed, not a fully potted plastic unit.
