Triangular craft w/ six amber lights over Nevada desert.

In the dark desert with a clear sky, I observed a triangular object approaching from the south.  Six amber colored lights were visible.  The craft flew north until overhead, then turned west and headed toward the military test range.  At first, I thought it was a formation of jets, but the precise turn and lack of engine noises, proved otherwise; there was no sign of engine glow (after burners, etc.), only the six amber lights.  Once the object was overhead, I could tell it was a single craft.  I watched it turn, without banking, and immediately head west, until it went over the mountains.  It is difficult to determine the size of the craft, but based on the speed and position in the sky, I would estimate it to be 300' on each size.  Since I was in an isolated area, I was able to hear the slightest noise, but none was created by the craft.  My viewing time was approximately three minutes.
Date is approximate.  PD