This is the Lindsay House at 4 Rosea Court in Thornhill. Their lighting display is amazing. Two brothers work together and design the light show to go with music. If you go to their website http://www.lindsaylights.com/index.html
you can watch a video of the music and lights. We were lucky to go there when it wasn't too busy. According to the website they now have a policeman directing traffic and it can take up to 45 minutes to drive by the house to see the light display.