an intermediate voltage or cable marker with a gas filled lamp with reflectively enhanced conspicuity comprising an inner conductive coating in an opaque shell ; the shell being mountable on an the intermediate voltage line and having one end of the gas filled lamp electrically connected to the intermediate voltage line or grounded cable and the other end electrically connected to a electrical coil in series with the conductive inner shell coating ; the gas filled tube being mounted in a reflective chamber shaped to increase both lateral and vertical conspicuity .