GU10 to E26/E27 Light Sockets Adapter, Light Bulb Socket, Bulb Base Adapter, Converters Lamp Holder, Converts GU10 Pin Base Fixture to E26/E27 Standard Screw-in Socket (Pack of 5) - Amazon.com
LED BASES - a short overview - SEGULA GmbH
What's the difference between B22, E14, E27 & GU10 Bulbs?