from my prospective the best fruit to light a light bulb would be a lemon because the lemon contains two types of metal, zinc and copper, these elements could light a light bulb. They are also some of the most important elements to light a light bulb. How they light a light bulb is that the acid in the lemon reacts to the zinc so it releases electrons, and then these electrons flow from the zinc to the copper and that’s how it lights a light bulb.