Originally Posted by cornflower2
Forget about using the simple, pure 'inverse square law' as it applies only to a 'point light source'
It does work if you use the ratio of the areas of the print rather than the enlarger height squared (although that will get you to a good starting point for further experimentation).
"People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.