Patent ID: 7452108

Claim:
A high intensity lighting fixture for increasing or maintaining useable light to a target area comprising: a. a lamp cone pivotally mounted to a fixture mounting knuckle; b. a reflector mountable to the lamp cone; c. a high intensity discharge lamp having a base mountable into the lamp cone and an arc tube having a tilt factor which causes decrease in lamp light output unless the arc tube is operated at or near a certain operating position regardless of aiming angle of the fixture relative to the target area; d. an automatic lamp position mechanism comprising a lamp yoke mounted in the lamp cone and pivotable around a first pivot axis, the lamp cone pivotable around a second pivot axis relative the knuckle to set different aiming angles for the lighting fixture; a mechanical linkage between the lamp yoke and the lamp cone adapted to pivot the lamp yoke around the first pivot axis proportionally to any pivoting of the lamp cone around the second pivot axis, the amount and direction of proportional pivoting of the lamp yoke in the lamp cone adapted to automatically maintain a selected arc tube operating position relative to horizontal for a range of lighting fixture aiming angles.