What are ga laws on blue running lights under your car?

are you allowed to have any type of blue light on your car?

“Just the good ol’ boys,
Never meanin’ no harm,
Beats all you’ve ever saw, been in trouble with the law since the day they was born.
Straight’nin’ the curve,
Flat’nin’ the hills.
Someday the moutain might get ‘em, [...]