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You are here: Home > Incandescent Light Bulbs > "A" Bulbs Choose a sub category: A15 A19 A21 A23 "A"  Bulbs are the most common general purpose incandescent light bulbs in use today. The "A" designates that the shape of the bulb is ARBITRARY, the number following the "A" denotes the width of the glass envelope in eighths of an inch. The four most common sizes of "A" lamps are: A-15,A-19,A-21, and A-23. A-15 bulbs are fifteen (15) eighths of an inch in diameter or 1.875" inches or 47.625 millimeters. A-19 bulbs are nineteen (19) eighths of an inch in diameter or 2.375" inches or 60.325 millimeters. A-21 bulbs are twenty one (21) eighths of an inch in diameter or 2.625" inches or 66.675 millimeters. A-23 bulbs are twenty three (23) eighths of an inch in diameter or 2.875" inches or 73.025 millimeters. The incandescent light bulb or incandescent lamp makes light by passing electric current through a wire filament in a glass envelope filled with an inert gas. The filament resists the electrical current and produces a glow (incandesces). One of the by-products of this production of light is heat. Incandescence is the emission of light (visible electromagnetic radiation) from a hot body due to its temperature. The term derives from the verb incandesce, to glow white. Price: Low to High Price: High to Low Most Popular Title Manufacturer Newest Oldest Availability 30 per page 60 per page 120 per page 180 per page 300 per page 1 2 3 25A19/IF/130V/4M 25 Watt A19 Inside Frost E26 Base 25A19/CL/130V/5M 25 Watt A19 Clear E26 Base Our Price: $0.36 Our Price: $0.37 Our Best Value! 25A19/IF/130V/4M 25 Watt A19 Inside Frost E26 Base - 25 Watt A19 Inside Frost 130 Volt Medium Base 4,000 Hour 25A19/CL/130V/5M 25 Watt A19 Clear E26 Base - 25 Watt A19 Clear 130 Volt Medium Base 5,000 Hour 25A19/IF/130V/5M 25 Watt A19 Inside Frost E26 Base 40A19 Ceramic Orange 120 Volt E-26 Base Our Price: $0.37 Our Best Value! Our Price: $0.51 25A19/IF/130V/5M 25 Watt  A19 Inside Frost E26 Base - 25 Watt A19 Inside Frost 130 Volt Medium Base,  5,000 Hour 40A19 Ceramic Orange 120 Volt E-26 Base - 40 Watt Ceramic Orange A19 Medium Base 120 Volt, 1,250 Hour 25A19 Ceramic Orange 120 Volt E-26 Base 60A19/IF/230V/2.5M 60 WATT A19 INSIDE FROST 230 VOLT E26 BASE Our Price: $0.51 Our Price: $0.58 25A19 Ceramic Orange 120 Volt E-26 Base - 25 Watt Ceramic Orange A19 Medium Base 120 Volt, 1,250 Hour 60A19/IF/230V/2.5M 60 WATT A19 INSIDE FROST 230 VOLT E26 BASE - 60 Watt A19 Inside Frost 230 Volt Medium Base 2,500 Hour 75A19/IF/230V/2.5M 75 WATT A19 INSIDE FROST 230 VOLT E26 BASE 100A19/IF/230V/2.5M 100 WATT A19 INSIDE FROST 230 VOLT E26 BASE Our Price: $0.58 Our Price: $0.58 75A19/IF/230V/2.5M 75 WATT A19 INSIDE FROST 230 VOLT E26 BASE - 75 Watt A19 Inside Frost 230 Volt Medium Base 2,500 Hour 100A19/IF/230V/2.5M 100 WATT A19 INSIDE FROST 230 VOLT E26 BASE - 100 Watt A19 Inside Frost 230 Volt Medium Base 2,500 Hour 25A15/CL/130V/3M 25 Watt A15 Clear E26 Base 25A15/IF/130V/3M 25 Watt A15 Inside Frost E26 Base Our Price: $0.76 Our Price: $0.76 25A15/CL/130V/3M 25 Watt A15 Clear E26 Base - 25 Watt A15 Clear 130 Volt E26 Base, 3,000  Hour 25A15/IF/130V/3M 25 Watt A15 Inside Frost E26 Base - 25 Watt A15 Inside Frost 130 Volt E26 Base, 3,000 Hour 40A15/IF/130V 40 Watt A15 Inside Frost E26 Base 15A15/CL/130V/3M 15 Watt A15 Clear E26 Base Our Price: $0.77 Our Price: $0.78 40A15/IF/130V 40 Watt A15 Inside Frost E26 Base - 40 Watt A15 Inside Frost 130 Volt E26 Base, 3,000 Hour 15A15/CL/130V/3M 15 Watt A15 Clear E26 Base - 15 Watt A15 Clear 130 Volt Medium Base, 3,000 Hour 15A15/IF/130V/3M 15 Watt A15 Inside Frost E26 Base 15A15/IF/12V 15 Watt 12 Volt A15 Inside Frost E26 Base Our Price: $0.78 Our Price: $0.80 15A15/IF/130V/3M 15 Watt A15 Inside Frost E26 Base - 15 Watt A15 Inside Frost 130 Volt Medium Base, 3,000 Hour 15A15/IF/12V 15 Watt 12 Volt A15 Inside Frost E26 Base - 15 Watt A15 Inside Frost 12 Volt E26 Base, 2,500 Hour 40A15/CL/130V/2M 40 Watt A15 Clear E26 Base 60A15/CL/130V 60 Watt A15 Clear 130 Volt E26 Base Our Price: $0.81 Our Price: $0.85 40A15/CL/130V/2M 40 Watt A15 Clear E26 Base - 40 Watt A15 Clear 130 Volt E26 Base, 3,000 Hour 60A15/CL/130V 60 Watt A15 Clear 130 Volt E26 Base - 60 Watt A15 Clear 130 Volt E26  Base, 2,000 Hour 60A15/IF/130V/2.5M 60 Watt A15 Inside Frost 130 Volt E26 Base 40A19/IF/230V/2.5M 40 WATT A19 INSIDE FROST 230 VOLT E26 BASE Our Price: $0.85 Our Price: $0.94 60A15/IF/130V/2M 60 Watt A15 Inside Frost 130 Volt E26 Base -  60 Watt A15 Inside Frost 130 Volt E26 Base 2,000 Hour 40A19/IF/230V/2.5M 40 WATT A19 INSIDE FROST 230 VOLT E26 BASE - 40 Watt A19 Inside Frost 230 Volt Medium Base 2,500 Hour Replacement Bulb for FMP #503-1055 25A19/IF/12V 25 Watt 12 Volt A19 E26 Base Our Price: $0.95 Our Price: $1.09 Replacement Bulb for FMP #503-1055 - 40 Watt A15 Clear 130 Volt Medium Base, 2,000 Hour 25A19/IF/12V 25 Watt 12 Volt A19 Inside Frost E26 Base - 25 Watt A19 Inside Frost 12 Volt E26 Base, 2,500 Hour 50A19/IF/12V 50 Watt 12 Volt A19 E26 Base 100A19/IF/12V 100 Watt 12 Volt A19 E26 Base Our Price: $1.09 Our Price: $1.09 50A19/IF/12V 50 Watt 12 Volt A19 Inside Frost E26 Base - 50 Watt A19 Inside Frost 12 Volt E26 Base, 2,500 Hour 100A19/IF/12V 100 Watt 12 Volt A19 Inside Frost E26 Base - 100 Watt A19 Inside Frost 12 Volt E26 Base, 2,500 Hour 25A19/TB/120V 25 Watt A19 Blue E26 Base 25A19/TG/120V 25 Watt A19 Green E26 Base Our Price: $1.26 Our Price: $1.26 Deal of the Day Price: $1.05 You save $0.21! 25A19/TB/120V - 25 Watt Transparent Blue A19 120 Volt E26 Base, 2,000 Hour 25A19/TG/120V - 25 Watt Transparent Green A19 120 Volt E26 Base, 2,000 Hour 25A19/TR/120V 25 Watt A19 Red E26 Base 25A19/TY/120V 25 Watt A19 Yellow E26 Base Our Price: $1.26 Our Price: $1.26 25A19/TR/120V - 25 Watt Transparent Red A19 120 Volt E26 Base, 2,000 Hour 25A19/TY/120V - 25 Watt Transparent Yellow A19 120 Volt E26 Base, 1,250 Hour 75A21/IF/130V/5M 75 Watt Inside Frost A21 E26 Base 40A15/CL/130V E17 SCREW BASE FAN BULB Our Price: $1.29 Our Price: $1.48 75A21/IF/130V/5M 75 Watt Inside Frost A21 E26 Base - 75 Watt A21 Inside Frost Medium Base 130 Volt, 5,000 Hour 40A15/CL/130V E17 BASE FAN BULB - 40 Watt A15 Clear 130 Volt Intermediate (E17) Base. 1,500 Hour 60A15/CL/130V E17 BASE FAN BULB 60A15/IF/130V E17 BASE FAN BULB Our Price: $1.48 Our Price: $1.48 60A15/CL/130V E17 INTERMEDIATE SCREW BASE FAN BULB - 60 Watt A15 Clear 130 Volt Intermediate (E17) Base, 1,500 Hour 60A15/IF/130V E17 INTERMEDIATE SCREW BASE FAN BULB - 60 Watt A15 Frost 130 Volt Intermediate (E17) Base, 1,500 Hour       1 2 3

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