Warp Lightning vs Fluor Lime

How close are they?

ΔE 13.5, fair: the same colour family, but not a straight swap. Fluor Lime is more muted, cooler than Warp Lightning. They are different kinds of paint: Citadel Warp Lightning is a one-coat contrast-style paint and Green Stuff World Fluor Lime is a fluorescent or effect paint, so they won’t behave the same on the model even where the colour is close.

Can I use Fluor Lime instead of Warp Lightning?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Fluor Lime is more muted, cooler than Warp Lightning. They are different kinds of paint.

Can I use Warp Lightning instead of Fluor Lime?

The same difference applies the other way round: Warp Lightning is more saturated, warmer.

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.