Abstract: A battery-powered lamp, such as a traffic hazard warning lamp has:A. a casing formed with ledges for location thereon of the bottom edges of the batteries to retain the batteries in the casing, a fixing bolt, extending through the casing, serving to prevent disengagement of the batteries from the ledges;B. said casing having apertures in two opposite sidewalls, each said apertures accommodating a respective lens which is a tight friction fit therein and may have ratchet-like teeth engaging with the material of the casing to retain the lens in position; andC. a switch in the form of a terminal strip engaged by terminals of the batteries, said strip being longitudinally slidable and having a bridging portion which is in or out of register with a stationary contact according to the position of the strip.