Yes, it's a subtle effect and you may not notice it unless you are looking for it specifically, but all runway lighting in FlightGear is directional. In other words the lights are brightest when viewed along the direction they are pointing and dim out as you move perpendicular to them, and disappear when they are pointing the opposite direction.
It's not as strong as in real life (possibly because I'm using a 16-bit card), but I do notice it, and have admired the work. I was just mentioning that we don't want to put too tight an LOD on the taxiway lights, since in real life, they're often the only way to find the airport at night.
All the best,
David
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