Hello,
Under Epic Games Launceher > Learn tab there is “Realistic Rendering” scene with complete assets, materials and light setups. There is a lamp material that you want to achieve. Please take a look at it.
Hope this helps, thank you.
I’m not sure if the scene mentioned above does it this way, but I’ve gotten very good results using the “Two Sided Foliage” shading model (or just “Two Sided” in some versions of the engine, I think).