Is there nothing such as NADPH2?
I answered this implicitly in a comment to my answer to: Light and Dark Reaction of photosynthesis?. Anyway:

There is no such thing as NADPH2. There is only NADP+ and NADPH. Consult Wikipedia or a reputable text such as Berg. 

The nicotinamide portion of NADP that  undergoes oxidation and reduction is exactly the same as in NAD. The changes undergone are:



The error either comes from confusion with the other redox cofactor, FAD / FADH2, or the fact that two electrons are involved in the reduction of NADP:


  NADP+ + H+ + 2e → NADPH