My Son and Grandson have developed an interest in coyote night hunting. At this point they are not interested in Night Vision or Thermal Imagining. They are using a good red light and need a scope that gathers light. I am thinking 6X will be about right for a 200 yard shot. Should I be looking for a straight 6 power or a 3-9X variable? Anybody out there with some experience? When reading scope specs, is there a way to compare light gathering ability?

Bill