"light grey" is correct and usable in written English.
This phrase can be used to describe a particular shade of grey. For example, "The walls of the room were painted a light grey."
As far as George's acting goes… he has nice light grey eyes, which can soften into a light grey or harden into a light grey.
They were dressed in light grey suits and blue shirts.
It is yet another shiny light grey coloured transition metal.
Traces blurs light grey almost white on white.
Light grey seeds were observed to be less predated on light grey ash, suggesting eucrypsis as a protective strategy against bird predation.
Nickel atoms are light grey, gallium atoms are dark grey, and oxygen atoms are red.
The light grey box at the top of the photo is a video-intercom.
Of the remaining 40, 23 were shared by Vero (light grey) and WSL-HP (white).
The NTH domain of Cx26 (light grey traces) shows significantly higher r.m.s.d.
Light grey shading indicates features that are significant in univariate but not in multivariate analyses.
The mouse and human sequences are schematically shown in dark and light grey, respectively.
