It's a 100W dome and I was thinking about a 75W bulb.
But I really did want to know if the bulb would physically fit in the dome without being too tight, sticking out beyond the dome or just being overly restricted.
But never mind, I wound up getting the larger one after talking to Zoomed customer service and getting the dimensions of both the Mini and Standard Deep Domes. The smaller probably would have worked but it was close and I felt I'd have more options with the larger one.
Thanks as always for your willingness to help.