opening hours for Luoyang Longmen Grottoes

Hello,

I have seen from google that at the moment the opening hours is up to 10.30PM, but this is differnt with what stated in the article (10.50 PM). Maybe at 19.50 is the last entrance but then you have time to visit the site up to 22.30... can someone clarify this point and tell me also the exact opening hours in September?

Thanks and regards
Max