"The color configurable bulbs or the high CRI bulbs typically use a 400nm led source and some do use a 380nm but those are much rarer and expensive."

Cree, Nichia, et.al. use ~460nm LED with a cerium-doped aluminum-yttrium garnet cover to convert to white light and have done so for at least half a decade. Just a bare look at the spectral output chart from any company will tell you the wavelength of the base emitter, with a MASSIVE output peak centered around 460nm.

Nobody has used UV as a white LED base for well over a decade or more.