Excelife Cinema LED Light Box, White

Trying to get a better sense of scale (as in, how far away this might be legible); does anyone know how tall the letters themselves are?

I see the dimensions for the whole unit…

Well given the total dimensions and subtracting out 1/8-1/4" (guessing) between each row for the guides, I’d say the letters are 2.5-2.7" tall. There’s also another photo of someone placing a letter into the light box, which should give you a good idea of scale