Tape a couple of lights either side of the camera next time ,.... just set em back slightly from the lense so as to avoid over exposure issues ,... can imagine the lights swivelled into a tight beam to give a nice distance shot, maybe even one distant and one wide for the short distance as well ,... just trial the set up at night in the back yard to acheive the optimum for down the shaft forrays ,..
And all should be well, pure subconscious now. :|