SOX-E 18w Low Pressure Sodium Lamp

The classic 18W SOX-E 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.

Product Code: LPS18W

Perfect for first-time SOX users, black fire experiments, darkroom photography, educational demonstrations, and monochromatic light exploration. Its compact size and manageable light output make it ideal for home experiments, small studios, content creation, and anyone discovering the unique visual effects of low-pressure sodium lighting.

Electrical Specifications:
Nominal Wattage: 18w
Rated Wattage: 18w
Lamp Current (EM) (Nom): 0.33A
Voltage (Nom): 57v

Lifespan:
Average Lifespan: 8,000 hrs
Life to 8% Failures (Nom): 6,000 hrs
Life to 30% Failures (Nom): 8,000 hrs
Life to 50% Failures (Nom): 12,000 hrs

Temperatures:
Maximum Permitted outer bulb temperature: 150 °C / 302°F
Maximum Permitted base edge temperature: 150 °C / 302°F

Base: BY22D

Energy Efficiency Class: A+

Operating Position:
H110 [ Hanging +/-110D or Base Up (BU)]

Luminous Flux: 1800 lm
Luminance: 10 cd/cm²
Luminous Efficacy: 100 lm/W

Unit Count: 1 Count
Max Diameter: 53mm /2.09 in
Max Length: 216mm / 8.50 in

UKCA, RoHS, CE

In stock in the U.S. and ready to ship worldwide. Every order is carefully inspected and securely packaged before shipment.

Free shipping to the U.S. and Canada. Free shipping to Oceania on orders over $299 USD. Shipping charges for other destinations are calculated at checkout. Tracking is included with every order.

30-day returns on all eligible orders. U.S. returns are free, while international customers are responsible for return shipping costs.

International orders may be subject to import duties, taxes, or customs fees. These charges are the responsibility of the customer and are not included in the purchase price or shipping cost.

All SOX lamps are backed by a 1-year limited warranty against manufacturing defects. If you experience an issue with your order, please contact our team and we'll work with you to find a solution.

Q: Is this a newly manufactured lamp?
A: Yes. All lamps are newly manufactured and tested before shipment.

Q: How do I know this lamp is compatible with my fixture?
A: Match the wattage and base type to your existing SOX lamp. If you're unsure, send us a photo and we'll help verify compatibility.

Q: What if I'm not sure which lamp I need?
A: Contact us before ordering. We're happy to help identify the correct lamp for you.

Q: Are these lamps stocked in the United States?
A: Yes. Orders ship from our U.S. warehouse for faster delivery.

Q: Can I still get replacement SOX lamps in the future?
A: Yes. We work directly with the current manufacturer to maintain a reliable supply of SOX lamps.

Q: Why buy from Lumioo Studio?
A: We specialize in SOX lighting and provide product guidance, compatibility support, and access to newly manufactured lamps.