Megaman Modo LED 4.5w GU10 are an ideal substitute for halogen lamps with significant cost savings. High luminous maintenance : 70% lumen at 50,000hrs These megaman lamps have a rated life of 50,000 hrs, Beam Angle of 35 deg, Luminous flux 300lm, lumen efficiency 67lm per watt and the dimensions of this lamp are 57mm length x 50mm diameter.