The Norman Lamps 25A19/FR-277V is a 25W, 277V incandescent A19 light bulb engineered for high-voltage commercial and industrial lighting circuits where standard 120V lamps cannot be used. Rated for operation across the 250–277V range, this bulb is well suited to commercial buildings, warehouses, stairwells, hallways, and other facilities wired at 277V — a common single-phase voltage drawn from 480V three-phase power distribution systems.

The A19 shape features a classic pear-style glass envelope measuring 4.10 inches in length and 2.38 inches in diameter, and fits any fixture with an E26 medium screw base. The inside frosted glass finish diffuses the light of the incandescent filament, producing a soft, even illumination that reduces glare and eliminates harsh hot spots — ideal for exposed-bulb fixtures, wall sconces, and general ambient lighting applications.

This incandescent bulb is fully dimmable and compatible with standard incandescent dimmer controls, allowing light output to be adjusted to suit the environment. With a rated life of 2,500 hours and a warm, natural incandescent light quality, the 25A19/FR-277V is a reliable drop-in solution for facilities requiring a 277V-rated A19 lamp in an E26 base format.

• 25W, 277V incandescent A19 bulb rated for 250–277V high-voltage commercial and industrial circuits
• E26 medium screw base fits standard lamp sockets; A19 shape measures 4.10 in. long and 2.38 in. in diameter
• Inside frosted glass finish softens and diffuses light output, reducing glare for comfortable ambient illumination
• Fully dimmable — compatible with standard incandescent dimmer controls for adjustable light levels
• Rated 2,500 life hours for dependable long-term performance in commercial installations
• Designed for 277V single-phase circuits common in commercial and industrial building power distribution systems

Tags: 25a19/fr-277v, (277v)