Big bright indigo/white light in the sky appeared. was facing west at the time. it then shot downward at a 45 degree angle split into two different larger lights then winked out. both lights had white centres surrounded by blue, violet, and indigo. lasted all of a second. though it is a flight path it was definitely too low in the sky and took up too much space to be a plane. was not a helicopter either as there was no sound and again was too big of an object relatively speaking. was not a fire work as there was no sound and the explosion of light was not big enough and no one was lighting fireworks over west calgary at 430 in the morning.