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Incandescent
Light Bulbs
These are all the normal light bulbs you may find around your house that have filaments that glow when electricity is applied,
halogen light bulbs are included, and fluorescent bulbs are excluded from this group. Incandescent light bulbs give off a warm cozy color where as halogen bulbs give off a much whiter color light.
Incandescent light bulbs are usually sold by the bulbs wattage, this is a measurement of the power that the bulb uses, and not the brightness. Many things may affect the brightness of the bulb including; the designed vs. applied voltage, the filament type, and the rated life of the bulb. The total amount of light a bulb creates is measured in lumens, and the amount of light that is received on a surface (your desk top) is measured in footcandles. One FC equals the amount of light received from one candle one foot away.
The rated life for most incandescent light bulbs are usually between 750 to 6,000 hours, the normal "A" bulb is 1,000 hours, and the normal "R" bulb is 2,000 hours.
Incandescent light bulbs are available in a multitude of shapes including:
- (A) - regular pear shape of standard light bulbs
- (B) - torpedo shape for chandeliers
- (BR) - bulged reflector shape, similar to (R)
- (C) - cone shape for little night lights
- (ER) - elliptical reflector shape, similar to (R)
- (F) - flame shape, decorative bulbs for chandeliers
- (G) - globular shape for vanity bars
- (PAR) - parabolic aluminized reflector shape, similar to (R)
- (R) - reflector shape, floods & spots for track lighting & recessed lights
- (S) - sign, specialty & indicator bulbs
- (T) - tubular shape for picture lights
The most common base types of incandescent light bulbs (by size) are:
- (E12) Candelabra - found on chandelier bulbs
- (E14) French Candelabra - found on chandelier and specialty bulbs from Europe & Asia
- (E17) Intermediate - found on specialty bulbs
- (BA15) Bayonet - found on specialty bulbs
- (E26) Medium - found on standard bulbs
- (B22) Bayonet - found on standard bulbs in Europe & Asia
- Mogul - the larger than normal base found on old trilight floor lamps
The ordering code for an incandescent light bulb is - wattage / bulb shape / bulb diameter / bulb color or finish / voltage / base type. Parts of the ordering code may be left off if it only comes one way, or if one way out sells any other way by a large margin. The bulb's diameter is measured in eighths of inches, for example a "100G40W" is 40 eighths of an inch in diameter which is; 40 X 1/8" = 5" dia. The ordering code for the most common light bulb is "60A" in full it would be "60A19FR/120V/E26" which translates to a 60 watt standard pear shaped light bulb that is 2.375 inches in diameter, frosted finish, designed for an 120 volt system, with a medium size base.
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