The Norman Lamps 1634 is a precision incandescent miniature bulb engineered for specialty low-voltage lighting applications. Operating at 20V and 20W with a 1A current draw, this S8 shape lamp delivers approximately 302 lumens of warm 2700K illumination with 24 mean spherical candlepower, making it a dependable choice for optical instruments and signaling equipment.

The 1634 features a Double Contact Pre-Focus base (P15d/P15D30A) that ensures accurate filament positioning for consistent light output alignment, a critical requirement in microscopes, projectors, and other focus-sensitive incandescent applications. Its clear glass S8 envelope maximizes light transmission and provides a compact footprint that fits neatly into tight instrument housings.

Commonly used as a replacement for Bausch and Lomb microscope illuminators (31-31-37, 31-33-20) and similar scientific, medical, photographic, and automotive indicator equipment, this incandescent miniature bulb provides 200 average life hours of reliable service. Each 1634 lamp is sold individually.

• Incandescent miniature bulb rated 20V, 20W, 1A with an S8 clear glass envelope for compact, focused illumination
• Double Contact Pre-Focus P15d (P15D30A) base ensures precise filament alignment for optical and instrument applications
• Delivers approximately 302 lumens at 2700K warm white color with 24 mean spherical candlepower output
• 200 average life hours of dependable incandescent performance for specialty low-voltage lighting needs
• Direct replacement for Bausch and Lomb 31-31-37 and 31-33-20 microscope illuminators and equivalent 1634 lamps
• Ideal for microscopes, projectors, medical instruments, photographic equipment, and automotive indicator lighting

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