Patent ID: 8736165

Claim:
A mercury-free discharge lamp comprising: a translucent discharge vessel which has a discharge space into which electrodes protrude for generating a gas discharge, said discharge space having a volume in the range from 17 mm 3 to 22 mm 3 ; wherein metal halides and ignition gas are contained in the discharge space, wherein the metal halides are present in a quantity in the range from 5 milligrams to 15 milligrams per 1 milliliter of discharge space volume in the discharge space; wherein the discharge vessel is enveloped by a translucent outer bulb, wherein an intermediate space between outer bulb and discharge vessel is filled with a gas or gas mixture having a lower thermal conductivity than air and having a pressure less than 1 bar; wherein the mercury-free discharge lamp has a luminous flux less than 2000 lm; and wherein, after termination of its ignition and startup phase, the electrical power of the mercury-free discharge lamp is less than 30 Watts.