I've used both infrared and white flash. Some deer could care less about the flash and you get them on the cam time and time again. Then there are deer that you get once. Is it because of the flash or are they just passing through? As far as getting pictures, move the cam often. As far as hunting and not pressuring deer, leave them setup and only check them every few weeks. I don't think deer will spook off of your property from a flash. But I also think that they may change trails based on the camera flash.