Edison is the term used to describe a lamp holder or light bulb with a screw style fitting (as opposed to one with pins which is known as Bayonet Cap)
There are 3 main sizes:
- Small edison Screw – SES – E14
- Edison screw – ES – E27
- Giant Edison Screw – GES – E40
The numerical values, E40, E27 and E14 relate to the measurement in millimetres across the light bulb cap. E40 = 40mm, E27 = 27mm and E14 = 14mm
Thomas Edison was the Inventor of some of the early versions of the incandescent electric light bulb.
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