painting with light

Photographers Comments
could any one shed some light (pun intended) on capturing light painted like this, sharper?
Jam




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Mate have a look at this. You may be able to get the same effect if you play around a bit. I know its not exactly what you are after but worth a look. If you have wacom, writing should be easier.
Creating light motion trails & glowing sparks | Veerle's blog

just what i wanted TCO cheers