How to keep billboard fully lit?

I am using a DynamicTexture to create labels in billboard mode. I have a HemisphericLight in the scene. This light reflects on the label. I am trying to keep the label fully lit no matter what direction the camera is pointing. I have tried disabling lighting for the mesh but that just makes everything black. How can I have an ambient fully lit label that ignores the other light? Here is an Playground to demonstrate the problem:

Using an emissive texture is better, since it requires no lighting.

I already have other things using emissive material colors interactively, so I didn’t want to conflict with that. I figured out that I wasn’t setting an ambient color for the material. I think I have figured it out. Here is the updated Playground:

I think I should have just played around longer before asking my question. I need more patience.

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