Light painting I did in the train tunnel recently.
Tool used was an orange acrylic tube with a purple plastic tip taped on the end. Scroll for pix.
Torch used was the Lightpainter from @lightpaintingparadise on strobe mode.
Tunnel illuminated with the RGB control unit of the 
Single exposure:
10mm, f/4.5
ISO-200, 101secs
Graffiti by
