Gloss “calima” by Ardalambion (Helge Fauskanger)

calima

bright

calima adj. "bright" (VT42:32); cf. ancalima; in PE17:56, arcalima appears as another superlative "brightest" (see ar- #2).

Cornwallet #1371

How do I know how to pronounce these words? Is another source required?

Elaran #1372

It's /'ka.li.ma/. The source would be the LotR Appendix E.