To determine size try to look at the rack on pictures if they show it or ask for size of frag plug they're attached to. Racks holes are 1" when i take pictures i get up a bunch of times to make sure i get what i see especially under blues. But that said best colors on pictures are under t5 or under 20k radions halides. With led only i see myself having to post process a lot more that before.
Here is a WYSIWYG I received on Friday from Aquascapers. Images were taken on Saturday.
A couple things to consider. This was shipped FedEx ground in my home state. Also, it was shot under LEDs (mostly blues) through the surface water. All 8 polyps opened up within 15 minutes. It is spectacular in person.