LED backlight in stainless steel casing. To be able to look at something in detail, light is required. That, which applies to the human eye, applies much more for automated visual quality assurance. A reliable, equitable lighting of the test objects is a key condition for being able to detect and recognize faults. The food, pharmaceutical and chemical industries require that such illumination complies with the toughest hygiene regulations. During cleaning it has to be able to withstand chemicals and high pressure water jets. ETW has developed the world's first LED stainless steel lighting with a real glass diffuser plate, which has a depth of just 12 mm.