Low-pressure mercury vapor discharge lamp and method of manufacturing the same

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A low pressure mercury vapor discharge lamp is provided, having a non-straight glass envelope (12) and a plurality of rare earth phosphor layers (13-17) coated inside the glass envelope. The lamp is made by coating a plurality of rare earth phosphor layers inside a straight glass tube. The tube is then formed into a non-straight configuration, each layer being sufficiently thin so that the phosphor coating does not flake off in sections where the tube is bent around a radius of curvature. A plurality of thin rare earth phosphor layers will not flake off in the bent section whereas a single thick rare earth phosphor layer will flake off. The invention is particularly useful in the manufacture of helical compact fluorescent lamps.