This is my favorite of the oranges. I admit I did a little dance when I got that glow just right. The best way I have found to get that glow, is to put it in first. And make it bigger than it actually is. Then come back in with the "white" bits, (pith) and put that OVER the glow. That works for other things that glow too: grapes, flowers lit from behind, sliced citrus, etc.