LIGHTING
Healthcare estates: unintended experiments Hospitals and other clinical facilities operate continuously. Staff are exposed to artificial light for prolonged periods. Patients recovering from surgery, trauma, or illness may be entirely dependent on the built environment for their physiological cues. Shift workers are already vulnerable to circadian
disruption. Combine sleep debt with inadequate daytime light exposure and constant, blue-weighted electric light, and we may be amplifying stress on biological systems already under strain. This is not alarmism. It is a risk management
conversation. Lighting decisions influence:
n Alertness n Sleep quality n Recovery environments n Staff wellbeing n Potentially long-term cellular resilience.
Facilities managers are not just maintaining luminaires – they are managing biological environments.
What can be done? The solution is not to abandon LED technology. Nor is it to ignore energy targets. The solution is evolution.
1. Treat daylight as infrastructure Access to outdoor light should be considered a health strategy. Structured daylight breaks for staff. Design that prioritises outdoor access. Avoiding windowless environments where possible. Even short exposures to natural
daylight can provide broader spectral input than hours under electric light. Light nutrition begins outside.
2. Design for spectral balance, not just illuminance When specifying electric lighting: n Consider spectral power distribution, not only CCT and CRI.
n Understand melanopic metrics but also recognise emerging research on longer wavelengths.
n Engage with manufacturers who can provide full spectral data.
CIE and CEN guidance provides frameworks. They should be used intelligently, not mechanically.
3. Supplement intelligently In environments where daylight exposure is limited – for example, deep-plan healthcare spaces or winter-heavy geographies – supplementation strategies may be appropriate. This does not mean installing infrared
heat lamps in corridors. It means understanding photobiomodulation research and exploring how future lighting systems may incorporate broader spectral components safely and responsibly.
April 2026 Health Estate Journal 53
1.0 0.8 0.6 0.4 0.2 0
BLUE-PUMP LED INCANDESCENT
LED (spectrophotometer A) incandescent (spectrophotometer A) incandescent (spectrophotometer B)
300 500 700 900 1100 wavelength (nm) INFRA-RED The above figure shows the differing wavelengths of LED and incandescent light. 1300 1500
speed radiance (normalised)
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