SOX 35W Low Pressure Sodium (LPS) Light Bulb

Glow Object SOX 35W Low Pressure Sodium (LPS) Lamp — Direct Replacement for Philips SOX 35W

Direct Replacement for SOX 35W Systems

Designed as a compatible replacement for Philips SOX 35W and similar 35W low pressure sodium lamps used in existing ballast systems. Standard B22 base. Ballast required, not included.

Thomas Duplex Safelight Replacement

The SOX 35W is the standard replacement lamp for Thomas Duplex Super Safelight systems and similar darkroom safelight fixtures. Provides the correct monochromatic amber sodium output required for film-safe darkroom illumination without fogging orthochromatic and many panchromatic film emulsions. A direct functional replacement for photographers and darkroom technicians sourcing compatible safelight lamps.

Darkroom and Specialty Photography Use

Widely used in film developing darkrooms, photography studios, lab environments, and experimental setups requiring stable monochromatic amber illumination. The 35W output covers small to medium darkroom spaces with consistent sodium light for controlled low-light working conditions. Suitable for professional and home darkroom installations.

Coastal Wildlife and Dark Sky Environments

The narrow 589nm sodium spectrum produces zero blue light, making the SOX 35W suitable for coastal wildlife protection lighting, sea turtle nesting area lighting, nature reserve perimeter lighting, and dark sky compatible installations where minimizing impact on nocturnal wildlife is required.

Astronomy and Low Light Pollution Use

Commonly used in observatory surroundings, backyard astronomy setups, and rural low light pollution areas. Compatible with dark sky practices to reduce upward light spill and maintain nighttime sky visibility.

Ambient and Low Stimulation Lighting

Used for soft room light applications in studios, hallways, and controlled visual environments for calm low stimulation evening use and wind-down night environments.

Creative Atmosphere Use

Frequently used for Halloween parties, sci-fi themed rooms, monochrome environments, cinematic stage lighting, retro industrial aesthetics, movie props, photography sets, and immersive art installations. The single-color sodium glow creates a distinct visual atmosphere different from LED or filtered lighting systems.

Room Size Reference

Frequently Asked Questions

Is this lamp a direct replacement for the Thomas Duplex Super Safelight?

Yes. The SOX 35W is the standard compatible replacement lamp for Thomas Duplex Super Safelight fixtures. It produces the same monochromatic amber sodium output required for film-safe darkroom illumination.

Does this lamp require a ballast?

Yes. A compatible low pressure sodium ballast is required and is not included. This lamp is not self-ballasted and will not operate without a matching ballast system.

What base does this lamp use?

Standard B22 / BY22d bayonet base, compatible with existing SOX lamp fixtures and Thomas Duplex safelight housings.

Is the SOX 35W safe for film developing darkrooms?

Yes. The monochromatic 589nm amber sodium spectrum does not expose orthochromatic film and is commonly used as a safelight source in professional and home darkroom environments. Always verify compatibility with your specific film emulsion.

Is this lamp dark sky friendly?

Yes. The narrow 589nm sodium spectrum produces zero blue light output, making it one of the most dark sky compatible lamp types available. Suitable for coastal wildlife protection zones, sea turtle nesting areas, and dark sky preserves.

Can this lamp be used outdoors?

Yes, with a compatible weatherproof fixture and ballast system. Suitable for outdoor installations including coastal wildlife lighting, nature reserve perimeters, and dark sky compatible outdoor environments.

What is the difference between SOX 35W and SOX-E26W?

The SOX-E26W is an energy-efficient compact lamp delivering equivalent lumen output to a standard 35W SOX lamp while consuming only 26W, making it better suited for always-on long-burn outdoor installations such as garages and pathways. The SOX 35W is preferred for darkroom safelight and Thomas Duplex replacement applications.

Technical Details

Model: SOX 35W Compatible Lamp
Base: B22 / BY22d Bayonet
Light Type: Low Pressure Sodium (Monochromatic Amber)
Applications: Thomas duplex safelight replacement, darkroom photography, coastal wildlife lighting, dark sky installations, and low glare ambient lighting.