I witnessed 3 large diffused flashing lights just above the tree line near Tallulah Falls, Georgia.

Last evening just before going to bed I noticed a large diffused flashing light just above the tree line outside my living room window.  I first thought the object was the moon and perhaps the wind was blowing a tree branch in front of the moon to make it appear to flash.  I watched for a about 30 seconds.  I got up and looked out the window and saw three of these large lights.  I went onto the front porch to get a better look.  I walked inside to have my 16 year old son verify what I was seeing.  He also witnessed the lights.  I asked him if he could hear any noise from an aircraft or helicopter, he could not.  My 6 year old daughter also saw these large diffused flashing lights.  We went inside so that I could get my glasses when we returned the lights were gone.  The sky was very clear and star filled.