Simply Conserve ENERGY STAR GU5.3 50-watt EQ 50-Watt EQ LED Mr16 Warm White G5.3 Base Dimmable Spotlight Light Bulb (100-Pack) in the Spot & Flood LED Light Bulbs department at Lowes.com
Sunlite MR16 Blue LED Bulb, 12 Volt, 3W, GU5.3 Base, 25W Equivalent (1 Bulb) | eBay
MR16 GU5.3 12V 75W Dimmable LED by Bulbrite | Marvel Lighting