From the post "Negative \(\psi\), New Particles, Vampires", when we have two optical fibers of different refractive index spliced together, the section with higher refractive index will cool down and the section with lower refractive index will heat up when it is carrying a beam of photons.
Only actual experimentation will tell whether a decrease in \(V\), corresponds to an increase or decrease in temperature of the material.
Collisions between material lattice and photons would suggests mass-less collisions that cannot be formulated directly.
