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What is the relationship between LED light efficiency and color rendering index?

2021-01-19 15:11:17
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The higher the LED light efficiency, the lower the color rendering index?
This is clearly not true.
First of all, the logic of causality is a bit reversed. It&#

Technology
The higher the LED light efficiency, the lower the color rendering index?
This is clearly not true.
First of all, the logic of causality is a bit reversed. It's not that the light efficiency is low so the light is high, but that some light efficiency is sacrificed in order to improve the light efficiency.
And many people's cognition of light effect still has some misunderstandings:
Light efficiency = luminous efficiency
Light effect ≠ luminous effect
The luminous flux (Lm) emitted by the LED light source divided by the power consumed by the light source (W) is called the LED luminous efficiency, unit Lm/W.
And the luminous effect refers to the visual effect.

For users of this question, plant growth lamp manufacturers for your detailed answer:

Factors affecting color rendering index

Now commercial LED, most of the blue LED chip coated with blue light can be excited (YAG) yellow phosphor, we usually called yellow powder, the chip emitted by blue light and phosphor emitted by yellow light complementary to form white light.

If you want to improve the color rendering of LED, at this time it is necessary to involve the calculation of the color rendering index, under normal circumstances, the calculation of the color rendering index is R1-R8, and the chromatography is relatively narrow.

But it would also be missing a very important spectrum, and that is the special finger R9, red R9 (saturated red;)
It is an index to evaluate the quality of red reproduction.
For their application, studios, film studios and other occasions that need to truly reproduce the skin color, as well as the color reduction of vegetables and fruits of fresh meat has an irreplaceable role.

▲R9 is also an important indicator to measure the color rendering of LED.

▲ Different R9 light color performance of fruits and vegetables, the greater the R9, the better the expression of red.

Therefore, it is far from convincing to use R1-R8 as the standard for judging the current color rendering index Ra.
In real life, you can often hear many manufacturers declare:

Color rendering index > 90

R9 > 50

So how do they do it?

How to improve the color rendering index of LED?

There is a saying "what is missing, what is missing", which is not accurate any more, since it is missing R9, then "fill R9", how to fill?

Add red phosphor to make up the red spectrum of LED and adjust the color rendering index of white LED.

This is related to the concentration of mixing, for example, if the original color rendering index of a LED is 70, to improve the color rendering index of 80, may only need to mix a little red phosphor, and to achieve the color rendering index of 90, you need to increase the concentration of mixing red powder.

This is not without cost. If the concentration of red phosphor is too high, the color point of LED will deviate from the Planck curve, causing serious color polarization.

▲ "Relative color temperature" 3000K

▲ The same color temperature is about 3200K, but the naked eye can see a significant difference.

Therefore, the proportion of the formula of red phosphor is not the same, the effect of the color index and color temperature is not the same.

In addition, red phosphors also have a property: the optical conversion efficiency is relatively low when excited, so they will invisibly pull down the overall LED light performance.

So, the effect of red and pink on color rendering index and light efficiency is already obvious:

1, red and pink concentration is too high, will cause serious LED color polarization

2, red and pink excitation when the optical conversion efficiency is low, will pull down the overall LED light performance.

How to improve the color rendering index of LED while ensuring the light efficiency, but also to ensure that the color is not biased seriously, each LED chip factory has its own "phosphor formula", which is also their core secret.

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