Smoke machines, or 'foggers' as they should be called, use a non-toxic liquid to generate a smoky haze that shows up light beams. I use a number of small Chauvet F-650 units that can be DMX controlled via an add-on DMX-3F converters.

Even if you use a computer to control your DMX lights it can still be useful to have a small stand-alone DMX desk for testing purposes. I use a DMX-40 from Chauvet. It allows up to twelve 16 channel fixtures to be controlled via sliders.

Finally, you need lots and lots of DMX cables. Most DMX devices use 3-pin XLR cables, but you should get hold of some 3-pin to 5-pin adapters just in case. You should also have a DMX terminator or two to connect at the end of your DMX 'chain'.
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Sean Clark will be contributing live video to the Bathysphere stage at Summer Sundae in Leicester this year. Watch out for the fringe festival too...
Sean Clark will be running an enhanced version of his 'Video/Laser Installation' at the Shambala Festival from the 21st to 24th August 2008.