@buttercup@michelleyoung All you need is a dead rat and a string to swing it on. (Tom Sawyer). Actually you need a light and a string to swing it on. This time I had a disposable light stick. Next time I try this I'll use a brighter light. I used a 10 second time delay and exposure was 30 seconds.
http://www.denissmith.com.au/photo-gallery/ball-of-light/