Inset paving light

Claim 1

A LAMP REPLACEMENT UNIT COMPRISING AN ELONGATED LAMP, A LAMP END MOUNTING MEMBER AT EACH END OF SAID LAMP AND HOLDING THE ENDS OF SAID LAMP, AND AN ELECTRIC CONTACT PORTION ON EACH LAMP END MOUNTING MEMBER AND EXTENDING AWAY FORM THE ENDS OF THE LAMP, THE CONTACT PORTION ON EACH LAMP END MOUNTING MEMBER HAVING A SHAPE WHICH IS ASYMMETRICAL IN A DIRECTION PARALLEL TO THE DIRECTION OF A LONGITUDINAL PLANE THROUGH THE LONGITUDINAL CENTRAL AXIS OF SAID CONTACT PORTION, THE CONTACT PORTIONS BEING ADAPTED TO BE INSERTED INTO RECEIVING ELECTRIC CONTACT MEMBERS IN A BASE OF A LAMP WHICH BASE HAS AT LEAST ONE LENS IN THE SIDE THEREOF AND WHICH CONTACT MEMBERS HAVE SHAPES COMPLEMENTARY TO THE SHAPES OF THE CONTACT PORTIONS AT THE RESPECTIVE ENDS OF THE LAMP AND SAID CONTACT PORTION ON SAID ONE LAMP END MOUNTING MEMBER BEING DIRECTIONALLY ORIENTED IN THE DIRECTION OF SAID PLANE FOR EASY INSERTION INTO THE RECEIVING ELECTRIC CONTACT MEMBER THEREFOR SO THAT THE CONTACT PORTIONS ARE ENGAGEABLE IN SAID CONTACT MEMBERS WHEN THE LAMP IS IN ONLY ONE ROTATIONAL POSITION RELATIVE TO THE AXIS OF THE LAMP, AND WHEN SAID CONTACT PORTIONS HAVE THE SAME SIZE, SAID CONTACT PORTIONS BEING ASYMMETRICALLY POSITIONED RELATIVE TO A LONGITUDINAL PLANE THROUGH THE LONGITUDINAL AXIS OF SAID LAMP, AND PARALLEL TO SAID FIRST MENTIONED PLANE, WHEREBY THE LAMP CAN BE POSITIONED IN THE RECEIVING ELECTRIC CONTACT MEMBERS IN ONLY ONE POSITION BOTH WITH RESPECT TO ITS END FOR END ORIENTATION AND ITS ROTATIONAL POSITION ABOUT ITS AXIS AND THE FILAMENT IN THE LAMP IS AT THE OPTIMUM POSITION WITH RESPECT TO THE LENS.