12215 JC12V/20W BA15S Bayonet Base Single Ended Halogen Light Bulb at eLightBulbs.com

Lumens (light output)

This refers to the literal measure of the light-output of a particular light bulb, measured in the number of lumens.

Watts (Energy Used)

"Watts" is the term applied to the amount of energy required and used by a particular light bulb. It is an international system unit of power equal to one joule per second. Contrary to popular belief, the wattage of a bulb does not directly measure the brightness; the "lumens" of a light is what defines the actual light output.

Average Lifetime

This refers to an average lifetime rating based on large quantities in test groups. This testing takes into account usage of 3 hours per start for fluorescent lamps and 10 hours per start for HID lamps.

Volts

Voltage is a measure of electrical potential.

Bulb Type

The "Bulb Type" is typically a combination of the style of bulb as well as the width of the bulb. Usually, the first couple letters will indicate the type; "G" would indicate "Globe", "PAR" would indicate "Parabolic Reflector"... The numbers indicate the diameter of the light bulb in eighths of an inch; a "G40" would be a "Globe" style that is "5 inches" in diameter.

Halogen Light Bulbs > Single Ended > Bayonet Base > 12215 (JC12V/20W BA15S)

20 watt 12 volt T3 Single Contact Bayonet (BA15s) Base Clear Halogen Incandescent Light Bulb

12215
JC12V/20W BA15S

Halogen Light Bulbs > Single Ended > Bayonet Base > 12215 (JC12V/20W BA15S)

20 watt 12 volt T3 Single Contact Bayonet (BA15s) Base Clear Halogen Incandescent Light Bulb

12215JC12V/20W BA15S

12215
JC12V/20W BA15S