The Norman Lamps 1631X is an 18W S8 incandescent miniature bulb engineered for precision optical, scientific, medical, and dental instrumentation. Operating at 6.5V and drawing 2.75A of current, this lamp is a well-established standard in specialized equipment, with confirmed compatibility with Bausch and Lomb microscopes, Zeiss instruments, and similar professional optical devices. The S8 glass shape and Double Contact Pre-Focus (P15d) base ensure accurate, repeatable positioning in equipment that requires precise filament alignment — a critical requirement in optical and illumination systems. The C-6 filament design delivers a measured output of 23 MSCP (mean spherical candlepower) through a clear glass envelope, providing consistent, undiffused illumination suited to the exacting demands of precision optics. The lamp measures 2.00 inches in maximum overall length and 1.04 inches in diameter, fitting the compact form factor typical of laboratory and medical instrument housings. Rated for 100 life hours, this incandescent miniature bulb is designed for high-intensity, focused applications where output consistency and reliable fit take precedence. It is sold individually as a single piece and serves as a direct replacement for equivalent lamps from Sylvania, Eiko, Ushio, and General Electric under the same 1631X designation.

• 18W S8 incandescent miniature bulb operating at 6.5V and 2.75A for precision optical and medical instruments
• Double Contact Pre-Focus (P15d) base ensures accurate, repeatable filament positioning in specialized equipment
• C-6 filament delivers 23 MSCP light output through a clear glass envelope for consistent, undiffused illumination
• Compact dimensions of 2.00 in. length x 1.04 in. diameter fit standard medical and laboratory instrument housings
• 100-hour average rated life; compatible with Bausch and Lomb, Zeiss, and other precision optical equipment
• Direct cross-reference to Sylvania, Eiko, Ushio, and GE 1631X lamps; sold individually

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