It seems from the way you have phrased your question that you think the frequency of the light corresponds to the number of photons per second. That's not the way it works. The number of photons per seconds would correspond to the brightness of the light for example you could have relatively few blue photons per second in the case of dim blue light or many blue photons per second for bright blue light of the same colour.
The frequencies you quote are (405 THz - 790 THz) are the frequencies of each individual photon of a certain colour. For example every photon of light from a red laser might have a frequency of 474 THz whether there are lots of them for bright light or few of them for dim light. For light from a blue laser all the photons might have a frequency of 620 THz etc.
So, I don't think there is really a good answer to your question. White light is made up mix of photons with different frequencies. The frequencies of photons, in the sense of how many photons arrive at some surface per second, would depend on the brightness of the light.