How many watts of incandescent light and energy-saving light are equal to 1 watt of LED light?
Since 1880, incandescent light have provided human beings with illumination for nearly 140 years. It can be said that without it, we will spend more than half of the space and time in darkness and darkness in the past century. However, at this point, energy-saving light and LED light bulbs with more power saving, longer life and higher luminous efficiency have become popular. Under the banner of global energy saving and environmental protection, incandescent light are about to be eliminated by history.
Many developed countries and regions, including my country's Taiwan, also proposed a plan to eliminate incandescent light as early as ten years ago. For example, in the recent Europe (which has long banned the sale of incandescent light), it was announced that on September 1, 2018, it will completely phase out halogen light. In fact, under this wave, global sales have dropped from 12 billion to 2 billion in the past 10 years.
At present, people in many countries and regions use energy-saving light and LED light. Leaving aside the lighting effect, LED light and energy-saving light have longer service life, higher light efficiency, and more energy saving and environmental protection.
However, many friends who are used to incandescent light may still stay in the previous concept. For example, in the era of naked light source lighting, a room may require 45W bulbs, and taller rooms may even require 100W bulbs. This wattage (power) is quite exaggerated in the era of energy-saving light and LEDs (the brightness will increase exponentially, and it is unbearably bright).
Sometimes we will see the word "luminous efficiency", which is what we call luminous efficiency. It refers to the luminous flux (represented by the symbol Φ or Φr) output by the light source per 1W of electricity consumed, and the unit is lm/W.
Lumen (lm) is the unit of luminous flux, representing the brightness of the light. The larger the lumen value, the greater the brightness. Generally, the packaging of light and lanterns will also mark the value, which can be directly judged which is brighter.
That is to say, under the conditions of the same wattage and the same type of bulb, the higher the luminous efficiency, the higher the brightness and the more energy saving.
Typically, incandescent light have a luminous efficacy of 12-24 lumens per watt;
The light efficiency of energy-saving light is 30-40 lumens/watt;
The light efficiency of LED lights can currently be 70-110 lumens / watt (some will be as high as 200 or more, but relatively few).
How many watts of incandescent light and energy-saving light are equal to 1 watt of LED light? Light bulb wattage conversion method
Luminous flux, illuminance
Let's give an example:
When the light efficiency of a certain incandescent light is 12LM/W, the 40W incandescent light flux is 480LM;
When the electro-optical conversion efficiency of a certain LED bulb is 70LM/W, the 7W LED light flux is 490LM;
When the electro-optical conversion efficiency of a certain energy-saving light is 30LM/W, the luminous flux of a 20W energy-saving light is 600LM.
In other words, the brightness that incandescent light can achieve with 40W of energy consumption, energy-saving light need more than ten watts, and LEDs only need 7W.
Therefore, based on the above algorithm, the conversion intelligence in the table serves as a reference. If you want to accurately convert the wattage, you also need to refer to the light efficiency of the light itself. And the number of watts of LED bulbs that cannot be killed must be equal to the number of watts of incandescent light or energy-saving light.
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