22 de septiembre de 2026

From the Laboratory to the Living Room: Managing My Circadian Rhythm with Low-Pressure Sodium (SOX) Lighting

Author: [Dr.] S. P. Andersson, Senior Researcher at Swerim AB

Category: Case Studies / Lighting Science

Editor’s Note: At Glow Object, we believe in the power of real-world application. In this case study, Dr. S. P. Andersson, a Senior Researcher in experimental physics, shares his personal experience integrating SOX lighting into his daily routine to regulate his circadian rhythm and improve sleep quality.

The Daily Routine: Physics and Biology

In my daily life as a researcher, my world revolves around experimental measurements, data, and analysis. To optimize my performance, I actively manage my circadian rhythm using the physics of light. My workday at the office always begins with high-intensity blue-enriched light therapy to maximize alertness and suppress daytime melatonin.

But when the workday ends, the shift begins. I turn off the office therapy light and transition to Low-Pressure Sodium (SOX) light—a routine that follows me all the way into my home.

Home office workspace featuring a Philips fixture with a low-pressure sodium SOX lamp designed for eye comfort and reduced blue light exposure.

The Neon Ignition and Warm-Up

Two hours before bed, I turn on the SOX lamp in my living room. The lamps slowly ignite through their characteristic neon start, gradually filling the space with a deep, amber-golden glow. This visual transition serves as my neurological cue that it is time for the brain to wind down.

Low-pressure sodium SOX lamp with a Jernkonst fixture creating a warm, blue-light-free environment in a living room for circadian rhythm support.

The Sodium Doublet and “Visual Silence”

Unlike modern LEDs, low-pressure sodium light is strictly monochromatic. It emits almost exclusively at the famous sodium doublet (the D lines at 589.0 nm and 589.6 nm), meaning it features completely ZERO BLUE™ light.

By avoiding the short wavelengths that trigger melanopsin receptors, the impact on my nervous system is immediate:

Zero Glare: My eyes relax instantly as optical scattering disappears.
Chromatic Calm: Sharp colors fade into soft shades of yellow and gray, inducing a state of visual silence.

The Circadian Result: Wide Awake, Deep Sleep

For a scientific mind running at full speed, this strict contrast is key. The morning light therapy keeps me sharp and awake during the day, while eliminating nocturnal blue light via the sodium doublet protects my natural melatonin synthesis at night.

By bringing this precise physics into my evening routine, I mimic the natural environment. It bridges the gap between high-energy daylight and the low-lux, yellow-red spectrum of a natural sunset, ensuring I fall asleep faster and sleep deeper.

Low-pressure sodium SOX light utilizing a Siemens fixture to illuminate a kitchen counter, demonstrating monochromatic lighting for home use.

Are you looking to optimize your home lighting for better circadian health?

At Glow Object, we specialize in high-quality SOX lighting solutions backed by science. Explore our Product Catalog to learn more about how monochromatic lighting can improve your living space and well-being.

Frequently Asked Questions

What makes Low-Pressure Sodium lighting different from standard household lighting?

Low-Pressure Sodium lighting produces a nearly monochromatic amber light concentrated at the sodium doublet around 589.0 nm and 589.6 nm. Unlike broad-spectrum white lighting, it contains completely ZERO BLUE™ light.

Where can SOX lighting be used in the home?

SOX lighting can be used in living rooms, home offices, kitchens, reading areas, and other evening spaces where a warm, monochromatic environment is desired.

How was SOX lighting used in this evening routine?

The SOX lamp was turned on approximately two hours before bed. Its neon ignition, gradual warm-up, and amber-golden output created a visible transition from daytime activity to the evening wind-down period.

What visual effect does Low-Pressure Sodium lighting create?

Under monochromatic SOX light, sharp colors fade into shades of yellow and gray. In this case study, the effect is described as “visual silence,” with reduced visual complexity and a calmer atmosphere.

What effects did the customer report?

The customer reported immediate eye relaxation, a calmer evening environment, faster sleep onset, and deeper sleep as part of a routine that contrasts blue-enriched daytime light with ZERO BLUE™ evening light.

Is SOX lighting suitable for a circadian-focused evening setup?

In this application, SOX lighting was used to eliminate nocturnal blue light and create a low-lux amber environment between daytime illumination and sleep.

About the Contributor

S. P. Andersson is a Senior Researcher at Swerim AB working in experimental physics.

Last Updated: September 2026

This article is part of the Low Pressure Sodium (LPS) Lighting Knowledge Hub, a technical resource covering the physics, engineering, efficiency, environmental impact, and specialized applications of Low Pressure Sodium (SOX) lighting systems.