Amazon.com: Maxxima Light Bulb Socket Splitter - 1-into-2 Converter, Ideal for LED, CFL, and Incandescent E26 and E27 Bulbs, Up to 660W, UL Listed for Garage, Closet, or Workshop Use - 3
MECCANIXITY E27 Double Base Bulb Socket M10 Thread Lamp Holder 2 Light Socket with Bracket Light Fixture Wire for DIY Lamp Accessories Ceiling Lamp - Amazon.com
Twin Bulb Splitter Adapter for Led bulb - 4Pcs Socket Splitter CFL Lightbulb E26 Bulb Outlet Adapter to Dual E26 Led Bulb Holder - US Power Adapter Screw in Plug Light Bulb