The relation between the ph of the thykakoid and the stroma is that the ph of thylakoid is lower than that of the stroma.
The ph of the thylakoid membrane is 8 under normal circumstances, but during photosynthesis it became extremely acidic, like 4. During the light reaction of photosynthesis, the electron transport chain uses the energy supplied by excited electrons to pump H+ ions from the stroma to the lumen of the thylakoid membrane. Both the stroma and the thylakoid membranes contain H+ ions. This proves that the ph of lumen of the thykakoid membrane is lower than the stroma.
We are aware that lumen has a large concentration of H+ ions and that the pH will be lower the more H+ ions there are. While plants often maintain an acidic pH in the stroma to increase the concentration and potential difference of H+ ions for ATP synthesis.
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