The photo-electric effect does not support quanta in light, since a light particle moving towards a surface cannot cause an electron to move away from the same surface at a right angle. Instead, a light wave can, by an interference effect, cause an electron to escape. This process is reverse in relation to a known process where the absorption of an electron particle causes a radiation of X-rays. Therefore, the photo-electric effect supports the wave model for light. So, Einstein made an important mistake by introducing quantisation based on the photo-electric effect. Einstein got the Prize for the equation only - not for evidence to quantisation - as often is stated. So, quantum physics started with an important mistake.
We can see that there is no dualism in light, and waves are all we need in our description of light. The wave-particle confusion started with a mistake regarding the photo-electric effect. See attachment regarding the wave-particle confusion.
John-Erik