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This heavy-duty 4-inch pinlight casing is engineered for recessed ceiling applications, offering wide ambient light distribution paired with the long-term maintenance advantages of an interchangeable E27 bulb system. Key Features Universal E27 Socket: Equipped with a standard E27 screw-type ceramic receptacle, giving you complete freedom to choose, replace, or upgrade to your preferred LED or CFL bulb wattage, beam angle, and color temperature. Seamless White Border: Finished with a clean, powder-coated white trim that integrates smoothly into standard commercial, office, or residential ceilings for a professional, flush look. Broad 4-Inch Aperture: The generous 4-inch profile allows for high-lumen output and wide-angle light dispersion, making it highly effective for general ambient illumination in larger rooms. Robust Metal Construction: Built with a durable metallic canister designed to safely channel heat away from the lamp socket and ceiling cavity, maximizing the overall lifespan of your bulbs. Heavy-Duty Retention Springs: Features rugged, pre-installed spring clips that ensure a tight, secure, and sag-free installation against drywall, acoustic boards, or drop-ceiling panels. Technical Specifications Brand: Biglite Model: YP4301A Aperture Size: 4 Inches Base Type: E27 (Screw-type) Trim Finish: Powder-Coated White Mounting Type: Recessed / Flush Ceiling Mount Application: General ambient lighting, commercial showrooms, corporate offices, retail spaces, and large residential living areas.