Incandescent light with parallel grooves encompassing a bulbous portion

DETAILED DESCRIPTION In accordance with the illustrative embodiments illustrating features and advantages of the present invention, there is provided an incandescent light having an evacuated envelope and an electrical filament.
The evacuated envelope has a bulbous portion and a neck portion.
This bulbous portion has a multiplicity of parallel grooves circling said bulbous portion longitudinally.
The electrical filament is centrally located in the bulbous portion of the envelope.
By employing such structure, an incandescent light with enhanced apparent efficiency is achieved.
In a preferred embodiment, a light having the shape of a conventional household incandescent light bulb is engraved with a plurality of longitudinal grooves.
These grooves circle the glass envelope of the preferred light parallel to what might be considered the equator of the light bulb when its neck is oriented vertically.
In the preferred embodiment, the grooves circle the entire bulbous portion of the incandescent light and the neck as well.
The grooves can be made either externally or internally on the envelope of the incandescent light.
Preferably, the groove to groove spacing is less than a 100th of a millimeter.
By employing such grooves, the light bulb has an enhanced apparent efficiency, in that the bulb appears brighter to a room occupant.
This brightness may result from a focusing of the light so that it is directed into the room more directly.