That is already a silly light flashlight as it is given it's specs. Olight's website has that flashlight listed at 1.83 oz. If you can cut weight from that it will be in fractions of an ounce. Cutting weight from the battery will mean cutting capacity. 550 lumens may or may not be overkill depending on the situation. Your night vision will be toast using any kind of white light, anyways. Seeing long distances will be the only limitation with using a smaller light. MY edc light is 350 lumens and is plenty for most situations. Anything even close to your needs list from a reputable company like Surefire or Streamlight will be as heavy or heavier than what you already have. A keychain flashlight is about all I can think of that would be marginally lighter and would fill none of your other requirements.