Ray Gun Glow vs Light Blue Green

How close are they?

ΔE 9.4, close: similar, with a visible difference side by side. Light Blue Green is a little darker, warmer than Ray Gun Glow.

Can I use Light Blue Green instead of Ray Gun Glow?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Light Blue Green is a little darker, warmer than Ray Gun Glow.

Can I use Ray Gun Glow instead of Light Blue Green?

The same difference applies the other way round: Ray Gun Glow is a little lighter, cooler.

ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.