It's all about the blinking...
See a comparison of the hardware used to run the displays between 2007 and 2014.
This year we have 22,980 lights installed, and to have some fun we have created a few install video's showing how the lights were installed this year, and they are located down the page a bit. Some of the display video's and still images are shown below.
Day 1 of the light install. Cleaning and some lights on the house.
Days 2 and 3 of the light install.
Day 4 of the light install, Megatree and arches.
Days 5 and 6 of the Lights install.