You may want to experiment with different metals. Go to http://en.wikipedia.org/wiki/Standard_electrode_potential_(data_page)
This table will tell you what voltages you will get when you use different metals. You may have to open your chemistry book to look up on the periodic table what the symbols for different metals are.
You will find the potential you get for a zinc copper battery, whick is close to what you got, 0.8 volts. You may want to switch to a different combination of metals and increase your plate area. The table will tell you what you get for different electrodes.
You may want to cheat a little and inject the lemon with concentrated lemon juice.
You may want to use something other than a mimi light. They draw way more amps that you will generate.
Try finding a digital clock that will run on a 1.5v battery.
Another idea will be to use aluminum foil and another metal. Put paper between the metals so the metals don't touch. Soak the paper in lemon juice. See how this works.
On the table aluminum Al is -1.6 v and copper is +.15 v
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