Abstract: A lighting device (2) comprises a light source (210) having a main forward emission direction (20), and an envelope (220) in which the light source (210) is arranged. The envelope (220) comprises an upper portion (225) having scattering properties and being arranged to reflect a part of the light from the light source (210) laterally and backwardly relative to the main forward emission direction (20) and transmit a part of the light from the light source (210). The light intensity distribution of the lighting device (2) is more uniform, as backward and lateral light intensity is increased while the light in the main forward emission direction (20) is still admitted.

Abstract: The present invention relates to a lighting device (1). The lighting device comprises a light source(7) arranged at a base (2) of the lighting device, the light source having a main forward emission direction (12). The lighting device further comprises a radio frequency, RF, antenna (10) configured to receive signals for controlling the lighting device and a reflector (9) arranged to reflect light from the light source laterally and backwardly. The RF antenna is arranged at the reflector. The present invention is advantageous in that the RF reception of the lighting device is improved.

Abstract: A method of generating a measuring signal indicating arc straightness in a gas discharge lamp (L) comprises the following steps: in a first step, applying a first lamp current (IN) to the lamp; in a second step, adding a brief pulse current (Ip) to the first lamp current (IN), allowing the lamp voltage to regain a steady state, and measuring the resulting average value of the lamp voltage (V2) in this steady state; generating a measuring signal indicating arc straightness on the basis of said average lamp voltage (V2) measured in the second step.