Light bulbs are coded with letter series and names to identify types and shapes. Below table lists different light bulb types based on letter series and names and which light fixtures these light bulbs fit best in.

Series	"A"	"B"	"BR"/"R"
Bulb Name	Arbitrary Designation (General Household)	Blunt Tip or Bulged	Bulged Reflector
Fit Which Light Fixtures	Ceiling, Chandelier, Lamp, Pendant, Vanity, Wall Sconce	Chandelier, Decorative, Pendant, Wall Sconce	Flood Light, Recessed, Track Light
Light Bulbs in Series	A19, A15, A21, A23	B8, B10, B13	BR30, BR40, R14, R16, R20, R25, R30, R40
Light Bulb Base  (North America)	E26	E12, E26	E17, E26

Series	"C7"/ "F"	"CA"	"G"
Bulb Name	Candle or Conical Flame	Candle (Flame Tip)	Globe
Fit Which Light Fixtures	Chandelier, Decorative, Pendant, Wall Sconce	Chandelier, Decorative, Pendant, Wall Sconce	Vanity
Light Bulbs in Series	C7, F10, F15	CA9, CA10	G16.5, G25, G30, G40
Light Bulb Base (North America)	E12, E26	E12, E26	E12, E26

Series	"MR"	"PAR"	"T"
Bulb Name	Multifaceted Reflector	Parabolic Aluminized Reflector	Tube
Fit Which Light Fixtures	Desk Lamp, Display, Track Light	Flood Light, Recessed, Track Light	Office, Shoplight, Bathroom, Kitchen
Light Bulbs in Series	MR11, MR16	PAR16, PAR20, PAR30, PAR36, PAR38, PAR46, PAR56, PAR64	T5, T8, T12
Light Bulb Base (North America)	GU10 (120VAC), GX5.3 (12, 24VDC)	E26	G5 (for T5). G13 (for T8, T12)

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