Ceiling Lights from: Utilitaire
Model: Disk Tripple Pendant lamp
Dimensions: Ø 45.7 cm. (eighteen')
Product Link:
https://www.restorationhardware.com/catalog/product/product.jsp?productId=prod15070063&categoryId=cat14010021
https://www.restorationhardware.com/catalog/product/product.jsp?productId=prod15070064&categoryId=cat14010021
https://www.restorationhardware.com/catalog/product/product.jsp?productId=prod15070062&categoryId=cat14010021
Good luck