Patent ID: 8729801
Filing Date: 2014-05-20
Classification: H01J

Abstract:
1. A metal halogen lamp comprising: an elongated arc tube enclosed in a transparent casing, wherein the elongated arc tube is made up of a hollow glass body comprising two end portions and a middle portion, an electrode arranged on the respective end portions, which electrodes, each having an electrode end, upon connection to a power source and during operation of the metal halogen lamp, are operable to generate an arc between them; wherein the glass body encloses halogens (h) and metal atoms (m) and has a wall thickness which is thicker on the end portions than on the middle portion, wherein the thicker end portions each have a length (LI) of at least one-third of the total length (L) of the arc tube, and wherein the respective electrode end is placed such that an imaginary line (y) between the electrode end and the region of the glass body defined by the transition between the end portion and the middle portion intersects the centre line (CL) of the arc tube at an angle of 25-50 degrees.