Lasham did some proper night flying last december in a Bocian. It is the only glider as far as we know that is approved for night flying and is fitted with nav lights. The runway was lit with £250 worth of lights and batteries from Poundland.
A question: A pilot of a powered aircraft sees the "nav lights" of a glider. The rules of the air state that he must give way to a glider. However, in the dark, because he is observing "conventional" navigation lights (rather than the alternative of a single red) he will assume it is a powered machine because there is no way of knowing otherwise unless he can see the aircraft itself and recognise it for what it is. If he is on the glider's right, he will expect the glider to give way to him. Obviously, the rules require him to hold a steady course.....
Presumably, glider pilots using "conventional" navigation lights will take this into consideration, especially so because these nights(!), gliders are so seldom encountered.