A lighting system for generating pre-determined beam-pattern comprises a reflector body for reflecting the light forwardly thereof, an optical means for receiving and transmitting said reflected light, a discharge lamp and a lamp base. The discharge lamp is positioned between the reflector body and the optical means. The discharge lamp comprises a sealed discharge vessel made of ceramic light-transmitting material and contains an ionizable fill. The discharge lamp has at least one leg, a pair of spaced-apart electrodes within the discharge vessel between which an electric discharge is developed when the lamp is operated. The lamp base provides for supporting and positioning the discharge lamp, and includes contact elements for connecting the discharge lamp to an operating circuit.