Yes, the lights in NL were much nearer. THAT'S what I would call "standard"!
There are 3 sets of Ishiharas (the 12- 24- and 36-Plates-Edition). Normally the 24- an 36-Plates-Edition are used by the AMEs.
But don't even think about learning them, because you have to look at them 5-yearly !!
If you make ONE mistake you have to pass HW. And if you don't pass the HW you're gone! And I don't think you'd like to be unemployed after flying for several years ...