...with a caveat 

If your trying to use maps intended for unity renderer in Poser, black in the unity map won't operate in Poser in the same way as it does in that tutorial. You'll probably have to hook up a separate mask for areas you don't want lit. You'll have to test this yourself, I don't see why a black and white mask hooked into the Emmision strength socket wouldn't work as it would in Firefly ambient value example I posted earlier. I'd do another test for that but I didn't save the test scene and am already working on a personal project. Heads up on that.