Abstract: A retractable dimmer sleeve comprises sleeve material formed into an elongated enclosed passage having an open end and an interior volume for receiving an elongated light source. The dimmer sleeve enables, during operation of a light source while received within the sleeve, adjustment of a length of a selected portion of the light source that is occluded by the dimmer sleeve so that only a fraction of light emitted by the light source escapes the dimmer sleeve. The apparatus may further comprise an elongated light source at least partially enclosed by the dimmer sleeve. A method comprises: enclosing at least a portion of the light source with the retractable dimmer sleeve; and moving, during operation of the light source while received within the sleeve, an end of the dimmer sleeve along the light source, thereby adjusting a length of the light source that is occluded by the dimmer sleeve.

Abstract: A screwdriver includes a handle including a receptacle for coupling with an end of a bit. A front groove and a rear groove are respectively defined in a front end and a rear end of the handle. A plurality of light-emitting diodes are mounted on a circuit board in the front groove of the handle. A transparent cover is mounted in the front groove and in front of the light-emitting diodes. A front cap is mounted to the front end of the handle. A cell and a switch are mounted in the rear groove. A rear cap is mounted to the rear end of the handle. The switch, the cell, the circuit board, and the light-emitting diodes are electrically connected. The light-emitting diodes forwardly emit light beams passing through the transparent cover to provide illumination when required.