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.