Preferably oil-free.
I use ELDW light, (colour suits me surprisingly well, pretty horrible in straight out of the tube), great staying power and all of that, but I find it has started breaking up a bit as the day goes on, and looks a bit cakey and flaky.
So, I reckon if my foundation had some light-reflective properties, it might reduce that look. The long lasting part is because a have an oily T-zone and I find foundation slides off my T-zone.
TIA.