[Richard777 (OP)]

A particle may act as an emitter, radiating heat and light. The particle is assumed to be spherical and has kinetic energy (dynamic energy). Thermal energy represents heat. Photonic energy represents the energy of light. Photo-dynamic energy is the geometric average of photonic and kinetic energies.

A force may be associated with each type of energy. The associated forces are components of a “radiant force vector”. The radiant force magnitude represents total force associated with a “radiant system” (thermo-photo-dynamic force).

A particle may act as an emitter or not. It is said to be “on” or “off”. A “radiant switch” is a condition which determines if a particle is in a “radiant state” or not.

Brightness is the power ratio of an emitter. It relates the power and size of an emitter to the radiant energies of heat and light.

If a black body condition applies, then the Stefan-Boltzmann constant may be easily related to components of a radiant force.

Can radiant force and emitter size represent the thermo-photo-dynamic energies of an emitter?