Lunasea Lighting G4 Back Pin 0.9in LED Light Cool White. As with all replacement bulbs the G4 includes a built in Buck Regulator which produces little heat making it the most robust on the market today. Specifications for Lunasea Lighting G4 Back Pin 0.9in LED Light: Manufacturer: Lunasea Lighting Color: Cool White Bulb Type: LED Features of Lunasea Lighting G4 Back Pin 0.9in LED Light Compact size Long Life: Up to 50000 Hours No Fire Hazard Like Halogens Package Contents: Lunasea Lighting G4 Back Pin 0.9" LED Light Lunasea Lighting LLB-21BC-21-00: G4 Back Pin 0.9in LED Light Cool White