Last year, a company's LED light efficiency made a major breakthrough, reaching 303lm/W. Many industry insiders praised it, and various "brick homes" also began to make bold predictions for the next step, 400lm/W, 500lm/W, 1000lm/ W...
Today, let's take a look: What is the maximum limit of light efficiency?
We have known since childhood: with electricity, more convenience, the use of electricity can not be finished. One of them is the light bulb that has liberated human nightlife.
How is electricity converted into light? Different light sources have different principles, but in general they are like this:
Therefore, the calculation formula of the luminous efficiency of the bulb is familiar to everyone, that is, the luminous flux is divided by the total power.
Spicy, what is the limit of this luminous efficiency? I am afraid that not everyone knows this.
Is the electricity in the bulb turned into a beggar?
First of all, let's recall that when the physics teacher at the beginning of the year kept the "energy conservation law" in our ears (the energy must remain conserved during the energy conversion process), this is a natural law that cannot be violated.
Taking the LED bulb as an example, if all the electric power is used, and the LED device works at the converted electric power P, two kinds will be produced: one for illuminating (optical power PV) and one for heating (thermal power PH ).
So, the above formula can also be transformed into a shape (learning math and physics like me, the most annoying variant of the hand?):
Let's take a chestnut. The following picture is a photoelectric test report of a COB device (I don't know if you can't read it?):
Figure: Photoelectric test report
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