36 may be drilled through the back plate 12 to facilitate the passing of wires 60 and 61 to the terminals 88 and 89 of the underlying device the drive circuitry 76 is preferably located behind the el lamp 14 and may be sealed to the back side of the el lamp 14 see for example fig8 a referring again to fig6 the opposite end of wire 60 is connected to a rheostat or variable resistor 18 one or more current limiting resistor s 99 are connected in series to the variable resistor 18 although only one el panel is shown in fig6 a plurality of el panels may be connected in series with each other the el panel has two electrical connections which are used to electrically connect the el panel 14 in parallel with the photoconductive cell 20 this el panel photoconductive cell parallel circuit has a first terminal connection 97 and a second terminal connection 98 an optional current limiting resistor 92 may be placed in series with the photoconductive cell 20 in this embodiment the current limiting resistor 92 is connected to the photoconductive cell 20 and to the first terminal 97 the current limiting resistor 99 is connected to first terminal 97 of the parallel el lamp photoconductive cell circuit the second terminal 98 is connected to the outgoing side of the switch 26 namely screw terminal 89 via wire 61 forming a closed electrical circuit a shadowing resistor 19 may be connected across terminal 97 and terminal 98 i e in parallel with the el lamp and photoconductive cell the shadowing resistor 19 reduces the sensitivity or reaction time of photoconductive cell 20 thereby decreasing the number.