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How to prove that energy-saving lamps are five times brighter than ordinary bulbs

Update:31 Aug 2018
Summary:

How to prove that energy-saving lamps are five times br […]

How to prove that energy-saving lamps are five times brighter than ordinary bulbs? This involves the problem of measurement. As we all know, the weight of a person is measured in kilograms. So what is the brightness measured? Also, the unit of measurement of brightness is lumens LM, how many lumens per watt, and the total lumens, which determines how bright the light bulb is? The national standard for ordinary light bulbs is 10lm/w, which means 25w, which has 250lm.

(The actual power and print power of the bulbs are basically 100%, because they have no cost difference, 25w and 100w are the same price), energy-saving lamps Lumen can generally reach 55lm / w, the lamp of some manufacturers, more than 15w, lumens can reach 60lm / w. This is a leap! Then the 5w lamp, the actual power 5x85% = 4.25w, 55lm / w, equal to the brightness of 233lm, close to 250lm, so that is equivalent to the brightness of the 25w bulb. Of course, if you use different materials, the material is less, 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 is not the same.