This Pilot Light, designed to last without maintenance for a bright indicator of process and machine operations, is easily installed into a standard 22 mm Dia cut-outs and connected with simple screw clamp connections. It is clearly distinguishable visually at a distance thanks to a bright and long lasting BA9s base illumination and transformer. It is impact-resistant, dust-resistant, water-resistant and vibration-resistant thanks to its IP66/IP67/IP69/IP69K, making it ideal for operation in harsh environments.