Algodoo

I made a very simple light script. i have also made one spotlight with focus and everything ,but it is not ready for use now. This one is a simple circular one, but it could be useful ,too. In the scene you can drag the lightbulb around without running the simulation. Of course, you can run the simulation for dynamic use.
Further description in scene.

IF SCENE DOES NOT WORK,type following code into console (F10):

(e)=>{
scene.my.lightfieldCirc = (posA, posB, intensity)=>{
x = posB(0) - posA(0);
y = posB(1) - posA(1);
value = (x ^ 2 + y ^ 2) ^ 0.5;
(1.0 / (math.tofloat(value ^ 2))) * ((intensity * 2) ^ 5)
}
}