We spend far more time under artificial light than our grandparents ever did.
From kitchen spotlights to bedside lamps, the type of light bulb we use can influence our sleep quality, circadian rhythm, mitochondrial function and even how quickly we wind down in the evening.
So what are the best light bulbs for supporting our health, and which should we be avoiding?
How light bulbs impact our health
The answer comes down to three key factors: blue light, infrared light and flicker.
Natural sunlight contains a full spectrum of wavelengths, including red and infrared light, which support cellular energy, circulation and healthy sleep-wake cycles.
Modern artificial lighting often strips out beneficial infrared wavelengths while increasing blue light and introducing subtle flicker. That combination can:
- Suppress melatonin at night
- Increase eye strain and fatigue
- Disrupt circadian rhythm
- Add low-level stress to the nervous system
Lightbulb listings: Best to worst
| Type of light | Light quality | Blue light content | Infrared (IR) | Flicker risk | Pro-ageing score | Best use |
| Incandescent | Warm, soft glow | Very low | High | None | ⭐⭐⭐⭐⭐ | Excellent for evening use; relaxing |
| Halogen | Bright, slightly cooler glow | Low–moderate | Moderate–high | Very low | ⭐⭐⭐⭐☆ | Brighter than incandescent but still IR-rich |
| Full-Spectrum LED | Balanced, daylight-like | Moderate–high | Low | Can vary | ⭐⭐⭐☆★ | Good for daytime; choose flicker-free models |
| Warm LED (2700K) | Warm white | Moderate | Low | Often flickers | ⭐⭐☆☆☆ | OK for evening if flicker-free |
| Cool LED (4000K+) | Harsh, bluish white | High | None | Often flickers | ⭐☆☆☆☆ | Avoid in the evening; suppresses melatonin |
| Fluorescent (CFL) | Flat, cold light | High | None | High | ☆☆☆☆☆ | Worst option for health; avoid when possible |
| Candlelight / Fire | Deep amber/red glow | None | High | None | ⭐⭐⭐⭐⭐ | Perfect for evening rituals, and winding down |
What makes a bulb ‘healthy’?
When choosing the best light bulbs for your home, consider:
Blue light content
This light is energising during the day, but disruptive at night.
Infrared presence
This supports mitochondrial function and circulation. Largely absent in LEDs and fluorescents.
Flicker
Many LEDs and fluorescent bulbs flicker imperceptibly. Your eyes may not register it consciously, but your nervous system can. Look for bulbs labelled “flicker-free”.
We don’t need to replace every bulb overnight, but we can make smart changes that better support our health:
- Use brighter, cooler light in the morning and daytime.
- Switch to warmer, lower-blue lighting in the evening.
- Keep bedrooms softly lit after sunset.
- Consider candles or lamps instead of overhead lighting at night.
