Hi,
I agree with FvM.
You mixing up "viewing angle" with "diffused" light.
With varying viewing angle the size of the light source stays the same.
But with a diffused light source, it may be achieved with an opaque glass or a diffusing screen, you have a big area of light source.
With a big area of light source, there is not a "point" you can fix, if it is recognised...
Also the safety issue. If the light comes from a big area, then the light energy is spread in the eye also. A small spot of light with the same energy may destroy the eye at those points.
The camera doesn't care if the light source is a small point or a big area.
Klaus