@cpixip I was mulling over your design a bit more and was wondering a few things:
Did you notice any difference in running temp on the different LEDs? Like the top one staying cooler because the hot air having an easy way out? If so, how about setting the baffles or tongues at 60 degrees instead of 120 effectively putting all the lighting sources on the top half? And to avoid direct light from the LED maybe try adding a slight angle of the LED openings toward the front? That way the LED would be “aimed” more towards the back of the sphere away from opening where the light exits.
And the second question I thought about was the surface: Have you tried reflective spray paint to coat the inside of your sphere? There might be some rattle can paints that could work.
And thank you so much for publishing your whole design evolution. Especially the steps that didn’t work so well are very helpful in knowing what not to try 