To add to what others have offered, the lighting when using a chrono indoors tended to be my greatest problem. What you want to end up with is a difused light source, free from reflections, etc. when-ever possible.
I solved my problem by taping some 8 1/2 x 11" sheet of white paper to the top of the supplied plastic diffusers and then used a portable light(with a 7-8" reflective socket and spring clip attachment) with a low wattage bulb. That way I could mount the lamp at various locations above the chrono to get the lighting I needed.