ANSI C78.377 is the publication from National Electrical Manufacturer’s Association (NEMA) that defines correlated color temperatures (CCTs) for LEDs. C78.377 has defined 10 CCTs (2200, 2500, 2700, 3000, 3500, 4000, 4500, 5000, 5700, and 6500 K). The recently released 2024 update adds definitions for CCTs of 2000 K and 1800 K for some outdoor and special indoor applications.
