on hks' website it said it was only for low beam application. This may just mean that there isnt a separate bulb (which it probably does) and im just ignorant.
I believe that the "N/A" means that the Protege doesn't have a separate high-beam bulb, because they have a column for fogs, too. I bought some bulbs a while ago, and I think the H4 has two separate filaments in a single housing.