How to prove that energy-saving lamps are 5 times brighter than ordinary bulbs? This involves the measurement problem. As we all know, the weight of a person is measured in kilograms. What is the measure of brightness? Also, the unit of measurement of brightness is lumens LM, how many lumens per watt, the total lumens, how much to determine this light bulb? The national standard of ordinary light bulb is 10lm/w, that is to say 25w, it has 250lm, (the actual power of the bulb is basically 100% with the printing power, because they have no cost difference, 25W and 100W are the same price), the energy-saving lamp's Lumens can generally reach 55lm/w, individual manufacturers' lamps, more than 15w, lumens can reach 60lm/w. This is a leap! Then 5W lamp, the actual power 5x85% = 4.25w, 55lm / w, equal to 233lm brightness, close to 250lm, so that is equivalent to the brightness of a 25w bulb. Of course, if you use a different material, the material that is worse, the lumen is not so high, that is to say it is not so bright, mainly depends on the material of the powder inside the lamp tube is not the same.
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