Object-source lighting on gauss weapons

Object-source lighting fails when it is everywhere at once. Pick a single emitter — here, the gauss coil — and commit to it.

The glow is brightest and most saturated right at the source, then desaturates and dims quickly with distance. Surfaces facing the source catch it; surfaces turned away stay in shadow.

Resist the urge to glow the whole model. The contrast between lit and unlit areas is exactly what sells the effect.