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confused man with glasses holding light bulb Energy consumption brilliant man has an idea holding light bulb like a genius global warming Technician reading the electricity meter hand holding a light bulb Technician reading the heat meter man with idea holding light bulb wearing glasses Technician reading the heat meter man throwing light bulb in the air man electrician placing light bulb Technician reading the heat meter Technician reading the electricity meter Technician reading the heat meter Technician reading the heat meter Technician reading the electricity meter