Greetings from Paris ('city of light' and currently city of dog shite
until they sort it out!).
Best introduction to Quantum Chromo Dynamics and Quanted Electro
Dynamics is By Prof Richard Feynman (RIP). 'QED - The strange theory
of light and matter' ISBN 0-691-08388-6 Princeton University Press.
Hope this helps you guys pumping photons.
Best Wishes,