I have used a bravo bca with xc1 surefire light since February this year. It is a very wide holster (5 inches), and it prints badly on me if worn with IWB optional clips. But I am pretty skinny guy. I tried two different positions for belt loops OWB and found the std 10 degree cant with upper loop screws in top position fit me best. I did not like it initially but after adjusting it found it OK for OWB. I think it conceals better this way with a short coat than it does IWB. This position also cants the holster away from belt a little bit and provides for a rapid draw. I got used to it but did not like it at all to start with. Same with their single mag pouch. It just takes up too much realestate. My twin FOBUS pouch is more comfy. You can carry OWB without light but most of holster/pistol tension is on the light, so it does not hold as securely without light. You can screw down four screws to get a bit tighter tension but not a whole lot.
One other problem w carrying light on pistol is it does change my point of impact about 2 1/2 inches to right at 25 yards. This really surprised me since the XC1 is so tiny. I repeated with a threaded barrel and same shift in poa/poi.
I came away from whole experience feeling like you need two identical pistols, one w a light and one without and holsters to match. I am dedicating one to a light with suppressor and the other clean.