I used to shoot some stuff at night, similar effect. Then I bought a piece of welding glass and manipulate the lighting that way. 30+ second shots. I to like to play around with this type of photography..
This is the last post I posted about the welding glass
Used a Light behind my hand
and
Candle Smoke
and
A wine Glass
Happy Photo experimenting!!
Yep, 30+ second shots is it! These with the Hulk were either 15 or 20. Soem of the others I've done were 30. I've found a lot of the exposure time depends on the material of the subject and how it reflects light.
I poked about those links and really, really like the wine glass.
I keep forgetting how much I enjoy photography until I get back involved in it again. So many fun things to do.