Is it possible?
Or are there any other way to manipulate the way lights work in minecraft?
Custom lightmaps are an Optifine feature so if you have Optifine installed you certainly can alter your lighmap. For instance, I use a custom lightmap to find where artificial lighting isn't bright enough to prevent mob spawning. The documentation for how it is done is here: https://github.com/sp614x/optifine/blob/master/OptiFineDoc/doc/custom_lightmaps.txt