Realistic Car back lights [Cycles] So I was working on a night scene with a model of a mustang. My scene looks similar to this:


I was wondering if anyone knew how to produce the glow of the rear lights; how they start orange, but are red around the edges.

This is what I have tried so far:

The light source is a point lamp behind the glass.

Any help would be appreciated!

Edit:

Here is the lights isolated from the rest of the car:


Here is the wireframe:

the four dark circles are the front lights

there is a point lamp behind them and the back grey part is glossy with 0.2 roughness

Edit 2:
Changed to Filmic colorspace:


Edit 3:
Final Render using Luke D's suggestion:


Edit4:

Here's the blend file of the rear lights:
 

Edit5:

Second Render after Luke D's suggestion:

I think it came out rather nice.
Final image with Compositing:



Different Color Ramp and Mapping node setups.



Scene overview:

Scene has three elements Emission source, Glass mesh and mesh to enclosed both of them. Also HDRI lightning.



Emission source:

Three Spheres with Emission shader mixed with Transparent (pure white, #FFF) by Light Path > is Camera Ray. We don't want to see'em.



Glass mesh and material:

Material:

Most important thing here. It's colored Transparent Shader mixed with Glossy by Layer Weight to have glass like reflection and to let light go trough. Don't forget to set Mapping node accordingly to your mesh.

You can control how much white, orange and red color you want.



Mesh:

This is just quick mesh created with Poke Face.



Final thoughts:

I've used also Glare node in Compositing to have nicer overall look.



Blend file:

Without HDRI lightning.