To use this particular Bulb (Plumen 26) with this lamp, you need to buy an adapter from e14 to e26, the link will be left below.

Ceiling Light by: Verpan

Model: PANTOP

Dimensions: H 16.6 cm. 6.5 in.

Product Links:

Lamp: https://www.archiproducts.com/en/products/verpan/metal-pendant-lamp-pantop-pendant-lamp_490366 

Light Bulb: https://usshop.plumen.com/collections/plumen-002/products/original-plumen-002-cfl 

Adapter from e14 to e26: https://www.bestlightingbuy.com/e14-to-e27-base-converter.html 

Good luck!