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Epoxy-Encapsulated Protection: Internal electrical paths are entirely sealed in defensive epoxy, providing superior protection against moisture, condensation, and corrosion in challenging environments.
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Sonically Sealed Polycarbonate Body: The tough polycarbonate lens and housing are permanently fused together via vibration welding to ensure complete environmental sealing.
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Vibration-Dampening Shock Mount: Specialized internal elastomeric bulb cradle insulates the high-output incandescent filament from heavy chassis shaking, drastically reducing premature bulb failures.
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Standard 4-Inch Circular Footprint: Designed to fit seamlessly into any standard 4-inch industry footprint, matching perfectly with existing standard 40 Series rubber mounting grommets or brackets (sold separately).
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Industry-Standard PL-2 Connection: Features an integrated 2-pin PL-2 socket on the rear of the housing for fast, plug-and-play wiring integration with your standard fleet pigtail harnesses.
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Future-Proof Upgrade Profile: Built to standard 4-inch industry dimensions, allowing an effortless, direct transition to energy-efficient LED configurations down the line using Truck-Lite’s Super 44 Series.
Truck-Lite 40227 – 40 Series 4" Round Clear Epoxy-Sealed Incandescent Interior Dome Light (PL-2 Connection, 12V)
Bring maximum environmental defense and clear, dependable illumination to your vehicle's interior with the heavy-duty Truck-Lite 40227 40 Series Dome Light. Engineered as an upgrade over standard interior utility lights, this 4-inch round clear sealed light head features advanced epoxy-sealed protection. It is a premier replacement choice for commercial semi-trucks, dry vans, refrigerated reefers, box trucks, and vocational service bodies where moisture, dust, or temperature shifts are a constant factor.
The structural foundation of the Truck-Lite 40227 is its high-impact polycarbonate lens and housing, which are permanently vibration-welded (sonically sealed) together. To take protection a step further, the internal electronics are fully encapsulated in a premium epoxy coating, forming an absolute shield against moisture intrusion and fine cargo debris. Inside, the high-output single incandescent bulb sits in a specialized internal shock mount that actively cushions the filament from rough road jolts, extending bulb life and ensuring your workspace stays bright under demanding conditions.