Wow, strobe type nav lights are pricey. Do older airplanes use common light bulbs with flashers similar to those in cars for turn signals (I know the frequency of flashes is specified by the FAA)? I assume the flashers were phased out at some point, but when it comes to airplanes, one shouldn't assume ANYTHING. Could newer and brighter bulbs (xenon, perhaps) be used with flashers to increase the lumens? Somebody that knows something about this, your answer is appreciated.