Provided in this disclosure is an apparatus for marking an implement, such as a snow plow. An elongated tubular member retains an illuminated member such an LED element within the interior. Conductor wiring connects a source of electrical energy to the LED. An enclosing cap includes a crimped end portion secured to the bottom end of the elongated tubular member. A cylindrical end portion has a hollow interior for admitting the conductor wiring for connection to the source of electrical energy. A perpendicular mounting bracket has a horizontal mounting surface and a vertical mounting surface, formed together at a right angle. The horizontal mounting surface is configured for connecting to the cylindrical end portion of the enclosing cap so that the elongated tubular member is disposed in a substantially vertical position. The vertical mounting surface is configured for connecting to a vertical portion of the snow plow.