A 50% het comes from breeding a normal with a 100% het - It has 50% chance of carrying the albino gene.
A 100% het comes from breeding a normal with a visual (in this case an albino). The babies are guaranteed to carry an albino gene.
Thought I would just add - Yep the young will be 100% het albino : victory:i have a male albino who is curently in with a normal female.....the babies will be het i know but is it 100% or 50% ?? i am not very good at the genetics !!!!