Patent ID: 7915826

Claim:
An electric lamp comprising an inner assembly including a light source, and a control gear circuit for controlling current in the light source and being connected to the electrodes of the light source; an outer envelope with a predetermined wall thickness, having an end portion and enclosing the light source and at least a part of the control gear circuit; the end portion of the outer envelope having a neck portion with an open end for receiving a base shell; the outer envelope defining a principal axis and being comprised of two parts separated along a circumferential line in a plane substantially perpendicular to the principal axis of the envelope, the two parts of the envelope being connectable and sealable to form a uniform outer envelope with a seal region; the seal region having a wall thickness and being merged in a surface portion of the two parts of the envelope so that the surface unevenness of the seal region is not greater than 0.5 millimeters; and the maximum difference of the wall thickness of the seal region with respect to the wall thickness of the outer envelope is not greater than 0.3 millimeters.