| Series | 
                                            557 | 
                                        
                                        
                                            | Certifications | 
                                            RoHS, Watertight to Mil-L-3661B Spec | 
                                        
                                        
                                            | Status | 
                                            Active | 
                                        
                                        
                                            | Features | 
                                            High Intensity | 
                                        
                                        
                                            | Mounting Hole Size | 
                                            0.687" (17.45mm) | 
                                        
                                        
                                            | Output | 
                                            Single Color | 
                                        
                                        
                                            | Emitted Color | 
                                            Green | 
                                        
                                        
                                            | LED Position | 
                                            Internal | 
                                        
                                        
                                            | Lens Style | 
                                            Flat | 
                                        
                                        
                                            | Lens Color | 
                                            Non-Tinted, Diffused | 
                                        
                                        
                                            | Voltage | 
                                            28 VDC | 
                                        
                                        
                                            | Mounting Method | 
                                            Nut/Washer | 
                                        
                                        
                                            | Max Panel Thickness | 
                                            .156" (3.96mm) | 
                                        
                                        
                                            | Mounting Torque | 
                                            15 | 
                                        
                                        
                                            | Mounting Torque Unit of Measure | 
                                            lb-in | 
                                        
                                        
                                            | Typical Current (mA) | 
                                            16 | 
                                        
                                        
                                            | Typical Intensity (mcd) | 
                                            4900 | 
                                        
                                        
                                            | Termination | 
                                            5.5" Wire Leads | 
                                        
                                        
                                            | Lead Wire Gauge | 
                                            24 AWG | 
                                        
                                        
                                            | Housing Material | 
                                            Polycarbonate | 
                                        
                                        
                                            | Lens Material | 
                                            Transparent Polycarbonate (UL 94V-0) | 
                                        
                                        
                                            | Lock Washer | 
                                            White Nickel | 
                                        
                                        
                                            | Nut | 
                                            White Nickel | 
                                        
                                        
                                            | Operating Temperature | 
                                            -25°C to +85°C (-13°F to +185°F) | 
                                        
                                        
                                            | Storage Temperature | 
                                            -30°C to +100°C (-22°F to +212°F) | 
                                        
                                        
                                            | Polarity Sensitive | 
                                            Yes |