According to https://support.thelightphone.com/hc/en-us/articles/36003112... there is a screen light which automatically engages in low-light situations. (although it doesn’t tell us the color of that screen light)

But it kind of doesn’t matter. The web site quite clearly said that the screen doesn’t emit blue light, and since the screen is e-ink it presumably doesn’t; it only reflects it. The site made no such claim about the separate screen light.

(Live by the “technically correct is the best kind of correct”, die by the “technically correct is the best kind of correct”. ;) )