Random flashing multicolored lights, with one spotlight, shining down onto my house.

Standing outside in my garden, I noticed a light on the horizon.  It was red at the beginning, but after a few minutes, it got brighter as it approached and resolved into a multicolored profusion of lights.  
The event lasted about 5 minutes, and during the last 30 or so seconds, the collection of multicolored, randomly flashing lights stopped directly over my house, which was about a hundred feet from the garden.  It was dark, so I couldn't discern the shape of whatever it was, just a bunch of randomly flashing multicolored lights.  
It appeared to be about 100 feet above the house, and if I had to guess based on the cluster of lights as an indicator of size, I would say that it was about 20 feet wide.  
Anyway, as it stopped over my house, a spotlight shone down from it onto the house.  I must emphasize that it made no noise at all during the entire time, even when it was almost directly overhead.  
When the spotlight appeared, I panicked and ran into the house.  The person who I was standing with outside watching it followed me after about 15 more seconds.  After I had calmed down some, we both went back outside and it was gone.
Witness indicates that date is approximate.  PD