The invention relates to an optical light guide comprising: a substantially rigid light transmissive body having an input window, a distal end, a front side (180), and a rear side (200); said light transmissive body having a substantially smooth exterior surface on said front side and a substantially clear and solid interior, said input window transmitting light into said light transmissive body and extending substantially transverse to a longitudinal axis of a light emitting diode (LED) light source (10); said light transmissive body substantially being a body of rotation about said longitudinal axis, and having a substantially constant thickness measured between said front side and said rear side, said light transmissive body extending way from said input window through an arc of from 60 to 120 degrees to an extension forming an output region extending towards said distal end; said rear side at least in said output region being formed with a plurality of reflective steps (240) directing intercepted light towards the front side.