Could you squeeze the molecules of light together? Does light even have molecules? What dimension is it in?
I am not sure about that molecules bit, I always thought of light as expressed in energy. and the energy can be concentrated by way of lenses mirrors. if that is the answer you are looking for. Please add detail.
Light is not made up of molecules, but rather photons which are bits of energy. Light exists in the same four dimensional space-time fabric as everything else. You cannot really squeeze photons together, because they do not have a defined spacial extent. However there are higher/lower intesity sources of light based on the energy put into the beam. More energy = more intensity = more photons. Light exhibits the strange particle wave duality which is prominent in quantum mechanics because it can display particle-like behavior as photons (the photoelectric effect) or wave-like behavior as oscillating electric and magnetic fields as discovered by Maxwell.
