is mounted within illuminator assembly 20 assembly 82 includes an elongated cylindrical housing 88 the rearward end of which is mounted on and fixed to seat 74 and the forward end of which is provided with a socket 84 for receiving bulb 80 mounted within housing 88 is a printed circuit board assembly 90 that includes a silicon controlled rectifier the firing angle of the silicon controlled rectifier is controlled in a four step sequence by any slight change of capacitance that is effected by manual touching of any outer metal surface of the lamp through an electrical connection shown by way of example at 86 between the metal surface of the lamp and the gate of the silicon controlled rectifier power is supplied to the input terminals of the silicon controlled rectifier via the two electrical leads of insulated cord 26 power is supplied to light bulb 80 by the silicon controlled rectifier via two electrical leads 96 98 which are connected to the electrical terminals of the lamp socket touch responsive electrical controls of the type used in the combination of the present invention per se are old in the art and are disclosed in u s pat no 4 613 790 in the name.