Patent ID: 7517115

Claim:
A reflector lamp having a longitudinal axis, the reflector lamp comprising: a concave reflector having a base disposed at one end; a discharge lamp having a discharge chamber disposed on the longitudinal axis within the concave reflector, the discharge lamp having a fill comprising or forming salts which, in the heat of the discharge lamp, when the longitudinal axis is deviated from an upright position, and especially when the longitudinal axis is essentially in a horizontal position, at least partially condenses from a vapor phase to a liquid phase as a condensate at a colder, lower side of the discharge chamber; the concave reflector having a reflective surface comprising at least two surface areas, a first surface area extending from the base, and a second surface area extending from the first surface area in a direction away from the base; at least the first and second surface areas having different contours defined by a rotating generatrix having a configuration of a selected conic section line; the contours of the surface areas and the disposition on the longitudinal axis of the center of light emission of the discharge lamp in relation to the surface areas are such that light from the discharge lamp passing through the condensate is distributed evenly over a surface being illuminated; and wherein the first surface area has a configuration of a paraboloid, and the second surface area has a configuration of an ellipsoid.