(under the class definition) Subject matter consisting of a light modifier having or combined with means cooperable with a light source envelope base (see, Glossary: "Light Source") to fixedly position the modifier relative thereto.
(1) Note. The cooperable means may, for example, grip or press against the envelope or press the modifier against the envelope with sufficient force that the friction between the contacting surfaces prevent one surface from moving relative to the other under normal operating conditions.
