Ping Pong Balls . . . . Really?

T-BOP...take a look at my Example-System 3 here:

http://www.macrocoins.com/example-system-3.html

"while many folks use ping pong ball diffusers attached to the Jansjo lights themselves, the original usage (and the way I have used them) was to attach them to the bottom of the objective. "
Same here.

Cut the ping pong ball in half. Drill a small hole in it a bit larger than the objective front lens element. Attach the half ping pong ball with hole to the objective with double-stick tape such that the hole is lined-up with the objective front element. Shine the lights onto the ping pong ball. Snap the shot.

I think you're looking to use them on Jansjos like Darth, correct? So no worries, but cutting them in half is still a bit tricky.

You might need to set the white balance to match the lighting with the yellowish ping pong balls installed.

BTW, I don't use ping pong balls at all -- I shine the jansjo lights on/through a lens-attached diffuser made of Canson Opalux paper.

First effort.
Please critique. Be brutal!
ISO 100
F-8
Shutter at 2/5 sec.
I tried to focus on the stars on the columns.

I was all over with focus. It doesn't get any better. I was not getting enough light on the piece.

Since I shot that, I have tossed all the ping pong balls.

I am now running four jansjos (plenty of light now) and have affixed a circle of Opalux around the lense and have the lights shining straight down, much like Darth's system, through the Opalux but no ping pong balls.
So far, I have been able to open the F-stop to 5.5, get more shutter speed. Around 1/60 if I recall.
I will post tomorrow a photo of my setup and what I have so far been able to get out of it.
I still want to try a few things.