PARADIGM SHIFT IN OPTICS. “While the generic technology realized by utilizing dressed photons has demolished the conventional wisdom of optics, for example, the unexpectedly high-power light emission from indirect-transition type semiconductors, dressed photons are still considered to be too elusive to justify because conventional optical theory has never explained the mechanism causing them.”
https://www.mdpi.com/2073-8994/12/8/1244/htm