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It is not possible that most lamps are not patented, because they do not meet the conditions for patenting.
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1 kilowatt electric heating appliance uses 1 kilowatt of electricity for one hour, that is, 1 kilowatt-hour = 1 kilowatt hour, which means that it uses 24 hours of electricity.
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1 kWh = 1000 watt-hours (Wh).
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It depends on the style and materials, as well as what brand it is. Generally, it is between 5-20 yuan.
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Generally more than 5 yuan (inventory is not counted).