We can summarise the photon picture of electromagnetic  radiation
as follows:
(i)
In interaction of radiation with matter, radiation behaves as if it is
made up of particles called photons (ii) Each photon has energy E (=hn) and momentum p (= h n/c), and
speed c, the speed of light (iii) All photons of light of a particular frequency  n, or wavelength l, have
the same energy E (=hn = hc/l) and momentum  p (= hn/c= h/l),
whatever the intensity of radiation may be By increasing the intensity
of light of given wavelength, there is only an increase in the number of
photons per second crossing a given area, with each photon having
the same energy