Simple mod to make the pip boy light cast shadows as well as the radius of the pip boy light is increased from 800 to 1200 a 50% increase.

I wanted to make the pip boy light flicker but It didn't work at the moment

I have posted a comment why the shadows may be glitchy Basically I say: 
"The thing about it Is I changed the light type to "Shadowcasting Omnidirectional" which in theory should have no problems, It never did in skyrim. Although you didn't use these specific type of lights when moving around in skyrim so that may be the problem.

It could be just an in engine thing that bethesda never thought people would mod a shadow casting pip boy light. So I think its something to do with the creation engine itself."