Just in case you ever come across jobs with Zumtobel’s earlier version of the fluorescent Slotlight system keep in mind they supply replacement gear trays and diffusers allowing you to update the lighting without touching the ceiling.

This has just happened at the Grove Leisure Centre with the original gear trays simply replaced with LED versions specifically designed for the job and the old diffusers replaced with new.
Not many manufactures can supply spare parts after over 14 years.