A lamp includes a light source, a cover configured to block the transmission of light from the light source, and a cover interface portion configured to interface with the cover such that the cover is disposed for upward and downward movement with respect to the light source between a first position configured to fully block the transmission of light from the light source and at least one second position configured to allow light from the light source to illuminate an area around the lamp. A track system, operatively associated with the cover, includes at least one track and at least one tracking element. The track system is configured for retaining the at least one tracking element for sliding movement along the at least one track to enable the cover to be held at various heights.
F21V 11/18 - Screens not covered by groups , , or using sheets without apertures, e.g. fixed movable, e.g. flaps, slides
F21L 14/00 - Electric lighting devices without a self-contained power source, e.g. for mains connection
F21S 9/02 - Lighting devices with a built-in power supply; Systems employing lighting devices with a built-in power supply the power supply being a battery or accumulator
F21V 3/02 - Globes; Bowls; Cover glasses characterised by the shape
F21V 14/08 - Controlling the distribution of the light emitted by adjustment of elements by movement of screens
F21V 17/02 - Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages with provision for adjustment
F21V 29/67 - Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
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