I was a cop for 10 years. I was in a life and death struggle, at night, and my incandescent Stinger hit the ground, and died. It was my only flashlight. I felt pretty helpless when my one and only light died at a time when I REALLY needed it. I never ever went back on patrol with only one light on my belt. My minimum was two lights on my belt for day shift, and three for night shift.
Your requirements are all wrong and make no sense. Many (most) lights that meets those requirements are probably low durability, low quality, general purpose lights, suitable for your grand mother to use to check the chickens at night. NOT suitable for a police officer that needs a working light as if their life depends on it (it does)
Does the dept provide a flashlight? Which one?