It's Sedenii Candidulum, because of the light color.
Here's my regular one from Ecuagenera. Phrag. schlimii Wilcox is supposed to be Sedenii but, I think the rounder shape and better substance and color show something extra in the parentage.
The colors are very temperature sensitive. Flowers that develop in cool to cold conditions have much more intense color than those that develop in warm conditions. You'd think they were different flowers.