Which bulb most efficiently changes electric energy to light, Physics

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A manufacturer of light bulbs advertises that its 55-W bulb, which produces 800.0 lm of light output, gives almost the similar light as a 60.0-W bulb with an energy savings.

The 60.0-W bulb produces 840.0 lm.

a. Which bulb most efficiently changes electric energy to light?

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