100A21/FR-277 - This incandescent light bulb is 277 Volts and 100 Watts. Light bulb life: 750 hours100A21/FR-277 Incandescent light bulb Cross References: 100/A-SHAPE/277 100/A-SHAPE/277V 100/A-SHAPE277 100/A-SHAPE277V 100/A21/277 100/A21/277V 100/A21/E26/FR/277V 100/A21/E26/FR277V 100/A21/E26FR/277V 100/A21/E26FR277V 100A21/FR-277 A21 Incandescent Light Bulb, Medium Base (E26)