A simplified fluorescence readout compares excitation, emission, and count. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Emission is lower than excitation
The excitation energy is 12 J and the emitted training photon has 8 J, so the gap is 4 J.
Egap=4J
Photon count scales total emitted energy
For 3 emitted training photons, the total emitted energy is 24 J. Joule-scale photon energies are schematic values.