Ushio 1001107 - JR12V-10W/NFL21 - 10 Watt 12 Volt MR16 Eurostar Narrow Flood Halogen Light Bulb

Most Malibu light fixtures that use reflectors like these come with 20 watt bulbs. If you don't mind a little less light, you can half your outdoor lighting kwh , which can add up during winter months while reducing your carbon footprint a (very) tiny bit; lights have narrower 21 degree beam which may be better for smaller plants, etc or may require moving the light farther away, reducing brightness a little more; reflector plate has mirror finish that is better than many 20 watt bulbs.