background creative design frame Grafic design lighting effect luminous texture texture Blue/white sky luminous nature seagulls sky view. green leaf overlapping shade blue sky clouds sky. view white/grey clouds landscape mountains river sea. white. Snowdonia base black blend canvas gray grayscale layer luminance mode pattern white bulb cap cost current double-contact-bayonet-base edison-screw-base electric-current electricity embedded-wires emissions filament gas-discharge globe glow glowing incandescence incandescent-light instant-start lamp light light-source lighting luminosity luminous-efficacy sleeve standard stem traditional ultraviolet ultraviolet-emissions ultraviolet-light ultraviolet-radiation bright case CFL diffused light housing illumination light fitting Light Fixture