Double Factor Spangles are different than Lutinos or Albinos as Double Factor Spangles' irises lighten normally with age.From what I know, DF Spangle is what you get when you breed 2 spangle parents and it cancels out.
They're not lutinos or albinos because they don't have red eyes. Their eyes also develop iris rings which is how you tell that they are not Dark Eyed Clears. They're just normal birds with one body color and usually no other markings on their back/wings.
More info here:
Albinos are white-based with red eyes.as far as i know Double factor Spangle are either Lutinos or Albinos depending on the base color; how about creaminos, are they also Double factor spangle? I am bit confused, please help me.