Minor surgery demands very specialized illumination. A high level of
general illuminance (1000 lux) with a high colouring index is achieved
by using recessed luminaires. These must be sealed, easy to clean units
protected against dust and infection.
Minor operating luminaires are normally ceiling mounted. They need to be very flexible, easy to control and easy to direct exactly where light is needed. The illuminated field needs a distinctive cut-off to avoid illuminating unwanted areas while providing a very high intensity. Excellent colour rendering is needed to distinguish between different types of tissue, and an overlapping multi-reflector/ lamp design provides excellent shadow reduction in case part of the light is blocked by obstructions. Also if a lamp burns out, the remaining lamps will work as a backup.