Two kilowatt short arc lamp having a metal heat-transfer pad

An improved short arc lamp (40) comprising a concave reflecting wall (46) with a convex-shaped spacing formed behind the concave wall and with the thickness of the reflecting wall portion near a focal point of the lamp being thinner than the thickness of the reflecting wall radially outward from said focal point and having a metallic sleeve member attached to the reflecting wall (46) within said convex-shaped spacing to conduct heat from the reflecting wall to an exterior wall of the lamp, the improvement comprising:

• a base (52) with an anode (44) positioned within the base and coaxial with said focal point;
• a insulative reflector body (48) coaxial with said anode and positioned coaxially about said focal point of said lamp with said thinner portion of the reflecting wall (46) near said focal point of said lamp extending axially further toward the base (52) than does an outside perimeter wall of said reflector body (48);
• a solid metal ring (54) coaxial with the base (52) and the reflector body (48) and sealingly attached between the base (52) and the reflector body (48) part of the outside circumferential surface of said lamp, having an inner surface exposed to said convex-shaped spacing;
• and
• a metal heat-transfer pad (58) attached at an outside perimeter with a fold to an inside surface of the solid metal ring (54) away from the reflector body (68) and attached at an inside perimeter within said fold to said thinner portion of said reflecting wall (46) within said convex-shaped spacing, wherein the solid metal ring (54) and the heat-transfer pad (58) form an all-metal pathway from said thinner portion of the body (48) to said outside of the solid metal ring (54) to conduct away heat generated in said reflecting wall (46).