the developer of overlap 2d sent me this : "well as far as I understand, there is nothing I can do. The way I see it, Construct2 is an editor that allows people building games without programming. Overlap2D is an editor that exports data, and then expects others with good programming skills to use that data any way they want. So I am not sure where can I help, who, and how. From forum it seems that developers of construct too do not understand what is that you guys want
Overlap2D does not do anything related to lights, it just positions things. that's all. and exports that data to a file. how do you want to use that data in construct2d I do not understand."
so the o2d is made for libgdx as i understand. libgdx has the ability of lighting system (better than c2) and then the o2d comes in and gives the developer an easiest way to drag and drop sprites and lights like an editor...
ive got to say that i feel very tired with all this, i believe that we will never have a decent working lighting system and normal maps thing or wait at least for a very long time...lights out (for real)