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Ken_K, thank you for your comment.
I used a cheaper Canon 430 II for light fill.
For what I do, guide number is non-existent, I bought it used and I couldn't be happier.
I had it barebulb, mounted on the camera.
I can't tell you the exact numbers but it was between negative 1.25 to 2.
I hope that helps.
oldrattler, thank you for your comment.