a chmsl or other lighting system feature of an automobile includes a feature for presenting personal expressions in the form of words or symbols but is automatically deactivated when the regular vehicle lighting system is in use . the personal expression is fixed in a tangible medium by way of phosphor - coated indicia placed within a uv impervious housing . a secondary uv light source selectively energizes the phosphor - coated indicia so that the irradiated material glows and is visible through a light transmissive screen . the light transmissive screen is provided with a uv blocking agent so that harmful uv rays do not escape the housing . the phosphor - coated indicia can be mounted on a removable transparent plate , on light dispersion optics , or on the inner face of the light transmissive screen . a control circuit manages the primary light source and the secondary uv light source so that only one of the light sources can be energized at any one time .