Double head G13 T8 lamp holder T8 fluorescent lamp socket 500v/2a for 15-80w led tube 101*54.8mm - AliExpress
NiceFoto FLH-02 Photographic Accessories Continuous lighting E27 Double Bulb Holder,Flash Lamp Bulb Light Stand Mount Umbrella Bracket - FOMITO.SHOP
E27 Base Porcelain Double Lamp Socket with 1/8ips Threaded Cap. CE Approved
Othmro Light Sockets,5Pcs T5 Lamp Holder,2A PC Plastic AC 500V 100Degree Fluorescent Light Holder,F288W Base Double Head Non-shunted Tombstone Light Socket for LED Fluorescent Tube Replacements White - Amazon.com
Bonlux R7S Bulb Socket 118mm Double Ended Lamp Holder Connector Metal Ceramics Handle for Flood Light, Work Light, Double-ended Metal Halide Lamp, Floor Lamp (5-Pack) - Amazon.com