Primitives (or walls) can also be lit from below. You just need to use a material with 0.999 opacity.
For example the plastics, check my tables, or fren tables, they use primitives and the light is below the plastic, you need to play with the transmission parameter.
The light object is too good in vpx: for example, you can also render the light bulb inside the bumpers:
you can tie a light to a wall , for example at height 60, and enable bulb in options. Then change the halo height and voilà, you have a nice mesh bulb with a light on top of it
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