This is a very nooby question but is there a way to have a (magic) texture with an emission (in EEVEE)?
$\begingroup$ if you have the image of that rainbow like texture, yes you can put it in your node setup as a emission $\endgroup$– Michael Ben DavidFeb 18, 2019 at 15:58
3$\begingroup$ "is there a way to have a (magic) texture with an emission?" No, textures can't have "emission"s since emission is a shader property. "Can a texture (magic) be used in an emissive shader?" It sure can. $\endgroup$– Duarte Farrajota Ramos ♦Feb 18, 2019 at 16:08
2$\begingroup$ Possible duplicate of How to make mesh lights work in Blender Eevee? $\endgroup$– metaphor_setMar 31, 2019 at 19:29
I think you want to go to the node editor and plug the texture into the color of the emission shader of your material.
You can control the strength of the emission shader in the node editor.
If you want the emission shader to light other objects, in Eevee the emission shader doesn't light other objects unless you add an irradiance volume (shift + A -> Light probe -> irradiance volume) and wrap the scene you want with it and then bake the indirect lighting in the render tab.