The Lindsay Lights in Thornhill, Ontario have been drawing crowds since 2002. Over 80,000 lights, most of them LEDs, blink to musical sequences that are broadcast over FM. The Lindsays have raised over $42,000 for local charities. The lights go on at 5PM every night through January 5th.
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When I first saw this a couple of years ago, I thought it was really impressive. Then I found out that it is just a "plug and play" kit. You set up the lights and plug them into a box that does all the sequencing. I was very disappointed.