40W incandescent LED bulbs equivalent number of Watt
Many people are in the online consultation 40W incandescent equivalent number of W LED bulb , or the number of W LED bulbs , etc. instead of 40W incandescent ? Even if the answer is also a variety of industry professionals , in the end is how it happened ? How can Equivalent it ? First, let's take a look , 40W incandescent lamp luminous flux is the number , LED bulbs per W luminous flux can reach the number , then we can be calculated , rather than empty and that there was no substantiation .
In fact, equivalent to incandescent bulbs and LED , which is the real flux , the luminous flux of the light source intensity is 1 within the solid angle of light emitted , which is a unit of time and the radiation energy band relative to the band rate of the viewing of the product. Under normal circumstances, 40W incandescent lamp luminous flux 400-480lm, 60W Incandescent 660-800lm, then the 40W incandescent lamp luminous flux equal to the number of W LED bulbs do ?
Today LED luminous flux per watt bulbs can reach 80-120lm, although some manufacturers that have made 140lm, cree April release can reach 160lm / w, specifically, how in the end , we have no way to study . Just some time ago , OLED has today expressed 180lm / w of the LED luminous flux is more realistic goal , perhaps in 2019 can reach 200lm / w. It is obvious from these data , each flux LED bulbs manufacturers are not the same , in today's LED market, the flux can reach 100lm are considered to be very good.
According to the above is easy to see , 40W incandescent lamp luminous flux 400-480lm, while the LED bulb luminous flux 100lm per watt or so, it is usually the case with 5W 40W incandescent LED bulbs light efficiency on the other, which means you can with 5W LED bulbs to replace . Of course, this is only theoretical data , in the end the truth, look at each of the manufacturers of how the quality of LED bulbs by integrating sphere test it out in the end how much . Article "40W incandescent equivalent number of W LED bulb " by the LED bulb housing finishing !