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.