SOX 35w Low Pressure Sodium Lamp

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.

Often considered the most versatile lamp in the SOX range, the 35W model delivers a strong balance of brightness, size, and efficiency. It is ideal for laboratories, university research, physics demonstrations, black-fire experiments, darkroom photography, optical testing, and educational environments where a distinctive monochromatic light source is desired.

Historically used in street lighting around the world, SOX lamps continue to be valued by researchers, lighting enthusiasts, collectors, and restoration specialists who appreciate rare and specialized lighting technologies.

Beyond science, SOX lighting has found new life in the creative world. The 35W lamp is well suited for photography, filmmaking, art installations, immersive exhibits, creator studios, theater productions, and experimental visual projects that seek a surreal, otherworldly aesthetic.

In stock in the USA and ready to ship worldwide. Each lamp is carefully inspected and packaged before shipment to help ensure safe delivery.

Note: Requires a dedicated SOX ballast to operate. Please see our Ballast Collection for compatible control gear.

Product Code:LPS35W

Our most versatile SOX lamp, ideal for laboratories, educational demonstrations, darkroom photography, optical testing, black fire experiments, and monochromatic light research. Popular among photographers, artists, filmmakers, and creators seeking a distinctive visual effect in home studios and medium-sized spaces.

Electrical Specifications:
Nominal Wattage: 35w
Rated Wattage: 37w
Lamp Current (EM) (Nom): 0.53A
Voltage (Nom): 70v

Lifespan:
Lifespan: 12,000 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: 4550 lm
Luminance: 10 cd/cm²
Luminous Efficacy: 129 lm/W

Unit Count: 1 Count
Max Diameter: 53mm / 2.09in
Max Length: 311mm / 12.24in

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.