Stainless Steel LED Signal Lamps. We have recently introduced stainless steel LED signal lamps and indicator lights to our product range.  These complement our Anti Vandal Switches and are available in the various cut-out options – 12mm, 16mm, 19mm and 22mm.   Built to withstand the demands of harsh environments, these signal lamps are IP67 rated.  Lamp colour and voltages are offered as follows: Colour Options LED Lamp Options   Red AC/DC 6V   Yellow .