Hi Gang,

In preparing for our test next week, we have noticed that there are different answers in regards to a 3:1 light ratio.

The London book states that a 3:1 ratio is a difference of 1.5 stops.

But, I have found other sources (my lighting class at CPW and other lectures attended this year) that state a 3:1 ratio is a one stop difference.

Can someone clear this up for me. Why are there two answers and which is the correct one for the sake of the PPA Certification test?

Thanks

Deb