bulb cutout isolated lamp light post source of light street lamp bible candle dark darkness flame light source reading text book lantern lightness metal iron wrought electric electricity furniture house lampshade sconce shade source abstract body body in darkness head in darkness light and shadow man man in dark one man only man only one man pattern shadow striped pattern base cap cost current double-contact-bayonet-base edison-screw-base electric-current embedded-wires emissions filament gas-discharge globe glow glowing incandescence incandescent-light instant-start light-source lighting luminosity luminous luminous-efficacy sleeve standard stem traditional ultraviolet ultraviolet-emissions ultraviolet-light ultraviolet-radiation