Light reaction photosynthesis

Hi

I teach Biology to A level

Im trying to get my head around the light reaction. I studied this during my degree along time ago and the books I used then are probably out of date. I would like to know how the hydrogen ions remain balanced across the thylakoid membrane. This level of understanding is not important for the course I teach but I have become curious.

I have created an animation to help me understand using various text books but there appears to be a build up of H+ ions on the stoma side and a removal on the thylakoid side.

To counteract this my animation requires I keep adding an extra ion to the thylakoid side and remove 3 H+ from the stroma side.

Please take a look at the animation and tell me where Im going wrong

link below

http://www.iddsoftware.co.uk/Resources.php and click the light reaction picture

Thank you