Fun in the Dark – (Writing with Light experiment)
This was my first attempt at writing with light on a long exposure using an LED torch/flashlight, directly towards the camera. Of course I accidentally wrote a mirror image of what I actually wanted to write. 
The actual “text writing” time during the exposure would have been about 10-15 seconds, ….out of the total exposure time of 120 seconds.
Notice my ghostly glowing face beneath the middle letter.
shutter – 120 secs
aperture – f8
ISO – 100
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This is my second attempt at writing with light on a long exposure using an LED torch. The actual “text writing” time during the exposure would again have been about 10-15 seconds, out of the total exposure time of 120 seconds.
shutter – 120 secs
aperture – f8
ISO – 100
Give this technique a go, …you can get some very strange effects happening! 
How’d you do that?
Hi Sue (ladrohan),
It’s fairly straight forward to set up.
You put your camera on a tripod and configure the camera to take a long exposure. In my case I used a shutter time of 120 seconds using an external timer, however you can still get usable results using a 30 second exposure as long as you move fast.
During the exposure you simply stand in the frame and write in the air with your flashlight/torch facing towards the camera.
As long as you keep moving then your body wont appear in the finished image. Wearing dark coloured clothes helps to keep you invisible too.
I managed to achieve some quite cool effects with this idea with a 15″ exposure on a somewhat smaller scale:
http://tr.im/8p66
Very interesting technique, tracing lines with lights and long exposure.