Hospital Room Lighting
Circadian design, examination light, and the difference between them.
8 min readUpdated April 2, 20262 topics
The four scenes
Well-designed patient rooms support at least four scenes:
- Ambient day — general illumination for family and quiet activity.
- Examination — high-CRI directional light at the bed.
- Patient-controlled reading — a warm, glare-free source at the head of bed.
- Nighttime pathway — low-level, low-CCT light to the bathroom.
IES targets
The Illuminating Engineering Society RP-29 Lighting for Hospitals and Healthcare Facilities gives task-based recommendations:
| Task | Illuminance (lux) | CRI |
|---|---|---|
| Patient bed — general | 100–300 | ≥ 85 |
| Patient bed — examination | 1000 (at task plane) | ≥ 90 |
| Reading | 300–500 | ≥ 85 |
| Nighttime observation | 5–20 | ≥ 80 |
| Bathroom — general | 300 | ≥ 85 |
Circadian tuning
Tunable-white fixtures shift CCT and intensity through the day (e.g. 3500–5000 K morning, 2700 K evening). WELL Building Standard and IES TM-30/TM-33 provide practical guidance. Clinical outcome evidence is still developing; the strongest signals appear in delirium prevention among ICU patients.
Standards
- IES RP-29 — healthcare lighting.
- IES TM-30 — color rendition metrics.
- CIE S 026 — melanopic equivalent daylight illuminance (mEDI).
- WELL Building Standard v2 — Light concept.
References & further reading
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