heres the story, i have a garage, the driveway goes up to the garage, we park our vehicles about 50 feet in front of the garage, it is pitch black in this area at night so i want to put a security lite over the roll up door on the garage that will lite up the garage door area and maybe up to 70 feet in front of the garage where we park at so we can see the vehicles when dark getting in and out. want one that comes on at dark and goes out when sun comes up. i want a metal halide type because its efficient and puts out white light taher than the amber color sodium puts out, but either one will do. My problem is i dont know what brightness to get, i dont want to lite up the whole 6 acres, but dont want it to be too dimm either, any ideas?
thanks