1-12pc LED spotlight GU10 MR16 GU5.3 AC220V 3W-8W warm white light replacement 50W 100W halogen lamp suitable for kitchen - AliExpress
Feit Electric 50-Watt Equivalent MR16 GU5.3 Bi-Pin 12-Volt Dimmable CEC Compliant LED 90+ CRI Flood Light Bulb Bright White (3-Pack) BPEXN/930CA/3 - The Home Depot
Multifaceted reflector - Wikipedia
MR16 GU5.3 LED BULBS | LED LIGHTING | SUNCO – Sunco Lighting
GU5.3 Vs GU10 Bulbs: Are They Compatible? - LED & Lighting Info
GU5.3 Converts to GU10 bulb - YouTube
LED Energy Saving Lighting Systems | Aeon Lighting Technology | LED Exchange UK
GU5.3 LED Bulbs MR16/GU5.3 3W LED Spotlight,3W(Equivalent 20W-35W Halogen Bulb Replacement) Warm White 3000K LED Spot Light Bulbs for Landscape Recessed Track Lighting,85-265V,240LM,Pack of 8 - Amazon.com
Quick look: The new MR16 spots with GU5.3 socket - Hueblog.com