A low power bag check light that will be on and off all night is going to be used at the entry points, right? Do you have a weirdly shaped venue that forces door security to also watch the crowd while controlling the doors? One compromise product might not be the best answer.
Hmmm... Now I have to go back and look at one of the lights on my railing. I think it's a Fenix from a few years ago. It lets you set two modes from its options. I have mine set for Low (walking light) with a bright strobe when I either hold down the tail switch or twist the head. It will probably fail your criteria because it uses either AA or 123 (forget which) and I doubt its over 200lm, but I think the operating modes are what you're looking for.
Edit - The light I spoke of is really a Quark Tactical QTA from a few years ago.