A lighting system is described having an electronic means for controlling the color, color temperature, magnification and focus in response to predetermined signals from a computerized system. A wide spectrum light beam having a wavelength of from 380 nm to 700 nm is passed through a heat absorbing condenser...http://www.google.co.uk/patents/US5045983?utm_source=gb-gplus-sharePatent US5045983 - Computer controlled light with continuously variable color temperature, color, magnification, focus, and position
