The problem with comparisons like that, Tim, is that they are, well... comparisons. In absence of something to compare it with, your "window blind light" would look the same as the other two, after our eyes (and brain) compensate for less light.
As someone above already stated, the best thing is to look at the print in the most likely light it is going to be displayed and see if you like it, not to use the screen as the ultimate criterion, but just a starting point. Yes, calibrate it properly; yes, soft proof; yes, use the good lighting to match it, etc., but ultimately, look at the print and see if you like it.