Hey guys, i got a question about calculating the Maintance factor. I discovered that i need several data for it so i can calculate it, im currently stuck with the lamp luminance maintance factor (LLMF) is there anybody here that ever worked with that and maybe can help me?

Would be very grateful for any help! I need help in particular to read this chart:
https://www.trilux.com/de/beleuchtungspraxis/fileadmin/beleuchtungspraxis/innenraumbeleuchtung/allgemeine-anforderungen/erhalt_des_beleuchtungsniveaus-wartungsfaktor/4.1_Erhalt_des_Beleuchtungsniveaus_Tabelle_4.3.pdf.png