The Norman Lamps 1731 is a 42W incandescent S11 miniature bulb engineered for precision specialty applications that demand consistent, repeatable light output in a compact form factor. It operates at 6.3V with a draw of 6.6A, delivering 47 MSCP of clear, unfiltered light output through a clear glass envelope. The S11 globe shape measures 1.42 inches in diameter and 2.38 inches in overall length, making it well suited for instruments and equipment with tight dimensional tolerances.

This incandescent miniature bulb is fitted with a Single Contact Pre-focus P15s base, which positions the filament in a fixed, repeatable location relative to the socket — an essential characteristic for optical systems where filament placement directly affects beam quality and illumination consistency. The CC-6 coiled-coil filament construction provides a compact, bright light source capable of efficient integration into reflector-based optical assemblies.

With a rated average life of 60 hours, the 1731 is intended for high-intensity incandescent applications where optical precision and a stable, high-wattage output take priority over extended service intervals. Typical uses include photographic enlargers, projectors, scientific and medical instrumentation, and other specialty devices that require an exact voltage, current, and filament position for proper operation. The clear glass construction allows maximum light transmission without color shift or diffusion, preserving the natural output of the incandescent filament.

• 42W incandescent S11 miniature bulb rated at 6.3V / 6.6A with 47 MSCP light output
• Single Contact Pre-focus P15s base ensures precise, repeatable filament positioning for optical accuracy
• CC-6 coiled-coil filament for compact, high-intensity light output in a tight package
• Clear glass envelope delivers unfiltered, unshifted light transmission
• Compact S11 form factor: 1.42 in. diameter x 2.38 in. overall length
• 60-hour average rated life; sold individually

Tags: 1731, s11, bulbs, p15s base, pre-focus