Lantern Energy Monitoring
In late 2007 I came across a device which allows you to determine how much power your appliances are using, and I thought that it might also be useful to determine the 'real' power of lanterns, so I bought one. (Mine came from Maplin - available to purchase from here.)
The device measures the supply voltage, current being drawn by the appliance, wattage, apparent power, supply frequency, power factor and also the kilowatt hour.
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