1x 3min exposure with a custom white balance of around 2600k to effectively 'cool' the Light pollution.
If you fancy trying your hand with Light Painting, I've got an article being published 16th May 2012 in Photography Monthly. It'll contain step by step instructions on what you'll need and where to begin.
So this picture (along with some other Light Painting pictures) will be published 16th May :o)
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