Paulmann URail Ceiling Socket E27 black

Amazon

DESIGN – The spot's understated look matches any interior theme and can have plenty of uses. CHOOSE ANY LAMP – Order a matching lamp you like right now! Optional app control for Smart Home lamps. SPOTLIGHT - directed light sets lighting accents by illuminating objects URAIL RAIL SYSTEM - individually illuminate different areas of a room individually using a single 230V power outlet REPLACEABILITY - The operating device can be replaced by end users without permanent damage to the luminaire.

Lights.co

URail Ceiling Socket - E27 socket for the URail track lighting system This E27 socket for the URail track is designed for combination with decorative light sources, such as overhead mirror or filament bulbs in a wide variety of sizes and shapes. The internal E27 socket and the track holder are concealed behind the metal cover.