Museums and exhibits: consider light dose
For sensitive objects, exposure time matters alongside illuminance.
Light can alter sensitive materials. Conservation assessment therefore considers exposure duration as well as illuminance and spectral composition. Lux-hours describe an illuminance dose, but do not provide a complete assessment of damage risk on their own.
Paper, textiles, dyes and other materials respond differently. Limits and display periods should be agreed with the responsible conservation specialists. A blanket claim that LEDs cause no damage is inappropriate: visible light can also affect sensitive objects.
Targeted control can reduce exposure time, for example through lighting on demand. Orientation, viewing and operation still need to remain practical. Record settings and operating periods, and assess daylight contributions too. Good presentation depends on suitable contrast and careful aiming, not necessarily on the highest possible illuminance. Review changes to the exhibit as well as changes to the luminaires.
What to clarify for your project
- Record material sensitivity and exposure duration.
- Assess daylight alongside artificial lighting.
- Document scenes, operating periods and changes.
Remember: Plan object protection together with conservation specialists.