Lighting device with light guide

A lighting device comprising:

• a longitudinal axis;
• a light guide extending along a plane positioned parallel to said longitudinal axis;
• said light guide having at least two main surfaces and an edge joining said main surfaces;
• said main surfaces being arranged for emitting light from said lighting device;
• a metal strip extending at least partly around the light guide along the edge of the light guide, the metal strip being arranged in thermal contact with the edge, wherein the width of the metal strip exceeds the thickness of the metal strip, wherein the width of the metal strip is measured in a direction from a first main surface of said at least two main surfaces to a second main surface of said at least two main surfaces and wherein the thickness of the metal strip is measured from said light-guide to an outermost portion of said metal strip away from said light guide, wherein the metal strip comprises at least one perforation such that a portion of said light emitted into the light guide is transmitted out of the lighting device through said at least one perforation;
• a solid state light source arranged in thermal contact with the metal strip and arranged to emit light into a portion of the edge of the light guide;
• said solid state light source being configured to transfer heat to the metal strip and the light guide, the light guide being arranged for dissipating heat to the ambient, both the metal strip and the light guide serving as heat sink;
• and a base for mounting the lighting device, the base including an electrical interface for connecting the sold state light source to an electrical power supply.