Edison Screw (ES) [E27] to 4x GU10. Simply screw this device to a E27 socket to allow you to use four GU10 light bulbs in one sockets for even better illumination. This adapter allows you to use 4 GU10 Light Bulbs in a single Edison Screw Lamp Socket.
eBay
3 in 1 Light Bulb Lamp Socket Adapter Standard Splitter E27 Change 3E27 Studio Lamp Holder
Aliexpress UK
It is one of the best choices for you.Are you looking for a professional, yet affordable lamp holder?. Are you in search of a sturdy, trustworthy tool that can do multiple jobs at once?. If yes, look no further!
eBay
E27 Splitter 3/4/5/6 Heads LED Bulbs Base Adjustable LED Light Holder Adapter Socket Converter Holder Lighting Accessory 87HA
Aliexpress UK
2x Bayonet Cap (BC) [B22] to 2x Edison Screw (ES) [E27] Light Bulb Splitter Adaptor. B22 to 2x E27 splitter lamp holder is 71mm high by 70mm wide (22mm screw to 2x 27mm screw). The regulations vary from country to country.
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Car Cigarette Lighter 12V-24V Socket Splitter Blue Atmosphere Light PD QC3.0 2 USB Charger C Ports For Mobile Phone DVR Chargers
Aliexpress UK
Its flexibility allows you to easily adjust the direction of the light, while its quality materials ensure durability and reliability. The E27 to multiple head flexible tube is a versatile accessory that allows you to convert a single E27 lamp holder into four lamp holders.
eBay
2Pack Light Socket Outlet Adapter with USB Port Porch Light Socket for Use with Smart Bulbs Light Bulb Socket Extender 5V 1.5A
Aliexpress UK
No need install tools. Simply screw the socket adapter into E27 socket, then screw in E27 bulbs. E27 bulb splitter socket is made of fireproof material, and anti-burning. 2/3/4/5-in-1 E27 light bulbs socket adapter allows 2/3/4/5 bulbs installed to one socket.
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Extractme 1 to 2 Car Cigarette Lighter Splitter Adapter Power Charger Port 12/24V Plug Socket 2-Way Splitter with Fuse
Aliexpress UK
Interface type: E27. Use LED or energy saving lamp. Durable, single lamp head can rotate, easy to use. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures.
eBay
E27 Splitter 3 Heads Adjustable E27 To E27 Base LED Bulb Adapter Converter Lamp Holder Socket Splitter Lamp Base
Aliexpress UK
1 x Dual Car Cigarette Lighter Socket Splitter 12V 2.1A 1A. Wiring kit for cigarette lighters to install in any. USB Output Current: 2.1A/1A. Blue Light. 12V-24V motorbike, Boat, Riding mower, tractor or car.
eBay
Car Cigarette Lighter Splitter Adapter 12V/24V, 1 Male to 2 Female Sockets with On/Off Switch, Y Splitter Car Accessories
Aliexpress UK
Simply fit this lamp holder to a B22 socket to allow you to use four E27 light bulbs in one socket for even better illumination. Bayonet(BC) [B22] male to 4. This adaptor allows you to use 4 Edison screw light bulbs in a single bayonet lamp socket.
eBay
USB Hub Splitter With Individual Switch USB 4/7 Port Splitter Individual Switch USB Adapter Hub Multi-Port Socket Powered ON/OFF
Aliexpress UK