Over the course of one solar cycle (one 11-year period), the Sun’s emitted energy varies on average at about 0.1 percent. That may not sound like a lot, but the Sun emits a large amount of energy – 1,361 watts per square meter. Even fluctuations at just a tenth of a percent can affect Earth.
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The economical lamp of Philips needs just 18 watts to produce the same amount of light as a regular 75 watt light bulb.
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The lamp consumed 480 watts giving an efficiency of about 15 lumens per watt.
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All the common electric lamps (less than 70 watts) are made with vacuums inside.
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