Hmm, just looked back through the entire thread and didn’t see that I answered the OP.
I’ve seen that plenty of times, and it’s rather “normal” for very-well-focused lights, especially with bigger reflectors.
In the GTmini or -micro thread, I pointed it out, and someone said it might be bad, but nope, I’ve seen that in other lights as well.
Most times, the hotspot is yellowish, and the “hole” is actually slightly blue.
Only thing I can say is that it’s most pronounced in larger reflectors with small LEDs and definitely SMO and not OP.
Kinda makes sense, though, in that the hotspot is made by light thrown off the sides of the LED (straight-out is spill), so if perfectly perfectly focused, you’ll get what’s essentially a doughnut-hole in the middle.
The bigger the LED, the more off-axis light hits the reflector and blurs the hotspot, covering up the hole.
So… P30, GTmini/-micro, etc., yeah, par for the course. Nowhere near as objectionable as a big angry corona around the hotspot, and often it’s actually hard to see unless you jiggle the light, so I don’t mind. In fact, I take it as a sign that it’s perfectly focused and -centered.