How to pronounce “point source” in English

As we approach totality, every object has a sharp direction and a soft one, 90 degrees apart.Take one point source of light, on its own it casts a perfectly sharp shadow, but add a second point, also perfectly sharp, but arriving at a different angle.Now, where the two shadows overlap, you get full darkness, but out at the edges, where only one of them lands, you get half the light. If you do it for more and more points,