When using AC/DC types with AC operation a very slight flickering can occur on occasion. EAO 10 Series Single LED Lamps, T5.5. EAO 10 Series Single LED Lamps, T5.5 The 10 series single LED lamps have been designed for use with their wide range of human machine interfaces. These could be panel mount indicators and illuminated pushbuttons and many more. They are equipped with a standard T5.5 socket. For a typical compatible actuator please see MPN 14-031.006, stock number ; 903-9319 903-9319