true stealth attack choppers

As you may or may not be aware it is possible to make aircraft completely invisable to the human eye. This is done by fixing powerful lights to the front of the aircraft. This was used on attack aircraft in WW2 to attack submarines without giving away their approach. I think this would be perfectly suited for attack choppers on todays battlefield. I think its really a waste of time giving attack choppers radar stealth as they are not moving fast enough using nap-of-the-earth flying tactics.