have you heard of this technique before???

[bazooka]

I believe it's called light painting. If you search for this, it seems most cases you'll see are people drawing designs with an LED or similar small-point light with really long shutter speed

i know what this is...it's not what i'm talking about

I looked at the pic in the link. It is precisely what I'm talking about. Unfortunately you seem to have cut off the 2nd half of my post. Perhaps you stopped reading halfway through.

 

[Amocholes]

I have tried this in a cave. This is the result of a 30 second exposure using no lights other than 3 high power LED flashlights. There has been no PP