A method of feeding a fluorescent lamp, wherein the actual power through the lamp is measured, an actual power value is determined by means of a moving weighted average of a series of most recently measured actual power values, wherein a measured actual power value is substituted with an alternative...http://www.google.co.uk/patents/US6628092?utm_source=gb-gplus-sharePatent US6628092 - Ballast and method of feeding a fluorescent lamp
