You’ve probably noticed that scrolling your phone at 11pm leaves you wired. That’s not a coincidence — it’s neuroscience. The color temperature of light directly affects your body’s production of melatonin, the sleep hormone.
What Is Color Temperature?
Light is measured in Kelvin (K). Lower numbers = warmer, more orange/amber light. Higher numbers = cooler, more blue light.
- 1800–2700K: Candlelight to warm white — ideal for evenings and sleep preparation
- 3000–4000K: Neutral white — good for kitchens and workspaces
- 5000–6500K: Daylight — stimulating, better for mornings
How Blue Light Disrupts Sleep
Blue-spectrum light (high Kelvin) signals your brain that it’s daytime. It suppresses melatonin and delays your natural sleep cycle by up to 3 hours. Most overhead LED lights and phone screens operate in this range.
The Warm Light Solution
Switch to warm white (2700K or lower) in your bedroom 1–2 hours before sleep. This simple change has been shown in studies to improve sleep onset time by 20–40 minutes.
All LUMÈRA lamps are tuned to 2700K warm white by default — the scientifically optimal range for winding down. The Glow and Ember are especially popular as bedside lamps for this reason.
Practical Tips for Better Sleep Lighting
- Dim your lights by 50% after 8pm
- Switch to warm-toned bedside lamps instead of overhead lighting
- Avoid screens for 30 minutes before bed (use a lamp instead)
- Use a lamp with a touch dimmer for easy adjustment