I am trying to make a cube/cuboid emit light. Now I am succesful in making it luminous (lighting up without the help of other lights), but it is not lighting up other things.

I have noticed switching the render engine to Cycles instead of Eevee fixes the problem, but the other problem is I am not trying to render it, but import it to Unity, which is not for rendering.

Also, rendering it Unity provides no color:

What should I do to make it light other things?

^{btw yes, i am making mettaton from undertale}