The classic 35W SOX lamp — a pure 589nm low-pressure sodium light source trusted for scientific, engineering, and creative applications. With its uniquely monochromatic output, this lamp remains one of the most efficient and visually striking light sources ever made.
Ideal for laboratories, university research, physics demonstrations, and black-fire experiments, the SOX lamp is also compatible with the Thomas Duplex Super Safelight. It has long been used in street lighting, optical testing environments, and by lighting collectors who appreciate rare, specialized and classic technologies.
Beyond science, SOX lighting has found new life in the creative world — perfect for art exhibitions, theater productions, sci-fi–themed parties, and creator studios that want a surreal, otherworldly look.
This lamp is in stock in the U.S. and ships directly from our warehouse. Note: Requires a dedicated SOX ballast to operate. Please see our Ballast collection page.
Dimensions
Unit Count: 1 Count
Max Diameter: 53mm
Max Length: 311mm
Specifications:
Bulb Cap Type: BY22d
Base: E39
Light Color: Yellow
Luminous Flux: 4,600lm
Color Temperature: 1,800k
Average Life: 12,000 hrs
Energy Efficiency Class: A+
