Very bright light observed twice

There was an electricity blackout from 10.30 pm until 3 am. I went out to the back yard because it was a clear night. I looked around the sky and a very bright white light caught my attention. It lasted for about one second and I thought it was an aeroplane but the light didn't flash. I looked in the direction of the light and after about 15 seconds it shone again. It was about 45 degrees up in a westerly direction. There were stars around the area but no bright ones. I wanted to see it again but nothing happened. A plane crossed the sky travelling NW, maybe on it's way to Jakarta or Malaysia. I waited until 2.05 am but did not see the bright light again. If this is the only report of this bright light then it won't be much use on its own but if others saw it, then maybe the time and position of the light will help you to judge height and location. The light came from the same position so I guess it wasn't moving. It seemed to be a long way off so I heard no sound.