... . Size, D 75 x24.3 mm.7. Lamp holder, GX53 lamp holder, surface mounted type, recessed type.8. Life span, 7,000 hours ... . Size, D 75 x24.3 mm.7. Lamp holder, GX53 lamp holder, surface mounted type, recessed type.8. Life span, 40,000 hours ... , 550lm.9. Housing material, Aluminum.10. Lamp holder OPTIONAL, GX53 lamp holder, surface mounted type, recessed type.11. Life span, 50,000 hours ...