The brands joined together as they share common supply channels, including luxury residential and hospitality sectors.
Opened during Clerkenwell Design Week, it showcases lighting design, alongside surfacing materials from Pentagon Tiles and Junkers flooring.
It also houses a working area and intimate courtyard space, plus a mood board section to view samples and materials.
The space has been developed to encourage architects and designers to create and connect with the Astro Lighting and Pentagon teams for a one-to-one visit.
Based at 45-49 Leather Lane, the London showroom is also open Monday to Thursday from 9am-5pm for general visits.
Established for over 25 years, Astro manufactures bathroom, interior and outdoor lighting.