Differences between 850nm and 940nm IR LED

Views: 0     Author: Grace     Publish Time: 2022-03-30      Origin: https://www.suntechleds.com/


1. What is infrared light?

2. What is an IR LED?

3. Regular LED VS IR LED

4. IR LED application

5. What is IR (InfraRed) LED Strip?

6. What is 850nm LED infrared light? 

7. What is 940nm LED infrared light?

8. Differences between 850nm and 940nm LED infrared light

The infrared LED lights on the market are also called infrared emitting diodes or infrared lights, and the wavelengths are mainly 850nm and 940nm. We are often asked by others "What is the performance difference between 850nm and 940nm IR illumination?" The main difference between 850nm and 940nm IR LED is that the 850nm LED light source produces a slight red light, which can be seen a little, while the 940nm is completely invisible. Let's take a look at the specific differences!

What is infrared light?

Infrared radiation, or IR, is a type of radiant energy that can sense heat but is invisible to the human eye. All objects emit some degree of radiation, but the sun is one of the more obvious (IR) sources of infrared radiation because we can feel the heat from the sun. But we don't see wavelengths of thermal energy when they touch our skin. Infrared light is found in the electromagnetic spectrum between visible light and microwaves. The light visible to the naked eye is called visible light, and the wavelength of visible light is 380-700nm. The order of the wavelength of visible light from short to long is: purple light→blue light→cyan light→green light→yellow light→orange light→red light. Light with a longer wavelength than red light is called infrared light. Infrared rays cannot be seen with naked eyes. 


What is an IR LED?

IR LED is an infrared lighting emitting diode. It is a solid-state lighting (SSL) device that emits light in the infrared range of the electromagnetic radiation spectrum.


LED is the abbreviation of Light-emitting diode, which means that the diode has the function of emitting light when current passes through.

An IR LED is a light-emitting diode, but its light is infrared light and is invisible.

IR LED application

① Security camera: The camera captures day and night images

② Remote control device: An infrared beam carrying binary code instructions is sent from the remote to the device (your TV or your child's Tonka truck)

③ Sensor System: The light level of the recording area can be monitored

What is IR (InfraRed) LED Strip?

(1) Red light and Near-infrared light

Red light available in 660nm / 670nm, 630nm /640nm

Near-infrared light options such as 730nm, 810nm, 850nm, and 940nm

  • With great flexibility, IR LED strips are perfect for harsh installation conditions.

  • Made with various LED component types (SMD 2835 and SMD5050 IR LEDs), available in different color, power, and optical density options.

  • Supplied with a self-adhesive back, these IR LED strips are easy to install.

(2) For Red Light Therapy or Near-infrared Light Therapy

  • Red light belongs to the visible part of the spectrum between 630-700 nm on the electromagnetic scale and is used to treat skin surfaces.

  • Near-infrared wavelengths fall into the invisible part of the spectrum between 700 and 1200 nm.

  • Near-infrared light with wavelengths between 700 – 1400 nm produces the most heat but does not penetrate deep into human tissue. Additionally, infrared light in the 760 – 895 nm range stimulates mitochondrial function, increasing metabolism, improving tissue repair, and reducing inflammation

(3) For Night Version

IR LEDs are usually used in security cameras, the IR strip under the camera with night vision (no IR filter), and you can see a red dot. These LED strips are ideal for surveillance or security, multi-touch displays, and night lights.

What is 850nm LED infrared light? 

The light intensity of the 850nm LED infrared in the visible part (less than 760nm) doesn't reach 0, in other words, it still emits weak visible light, and the human eye can still feel the faint light. 


850nm IR LED Strip

What is 940nm LED infrared light? 

940nm LED infrared night vision light has a peak intensity of 940nm, which is far from the wavelength range of visible light. When the light intensity reaches 0 in the visible wavelength range, which means the minimum wavelength is higher than the visible long wavelength of 760nm. Therefore, the 940nm infrared light is invisible to the naked eye.


940nm IR LED Strip 

Differences between 850nm and 940nm LED infrared light

Table 1: Differences between 850nm and 940nm IR LED from SuntechLed

Classification Visible light degree Sensitivity Radiation intensity
850nm Faint red light is visible High
940nm Totally invisible Slightly lower Low

1. The chip of 850nm infrared light has a visible red dot, while the main advantage of the 940nm wavelength is that the IR LED does not produce any visible light. In other words, they are completely invisible and can be used in applications that require more privacy. In fact, many people refer to it as "Covert IR". This type of IR is also useful where red light may be mistaken for a signal and cannot be used. The disadvantage of 940nm is that their efficiency is reduced by about 30-40%, and the distance of illumination is getting smaller and smaller.

2. In general, at the same current, the higher the wavelength value, the lower the forward voltage drop VF value. Under the condition of 20ma current, the VF value of 850 is about 1.35-15.55V; while the VF value of 940 is about 1.10-1.25V. Of course, the VF value will vary depending on the current.

3. The radiation intensity of 850 is about 2-3 times higher than that of 940. If the radiation intensity is high, the brightness will be higher. 

* Know more details about Infrared LED Strip 850nm 940nm.

Other LED products maybe you are interested in:

Frequently Asked Questions

(1) Is IR LED the same as LED?

LED is the abbreviation of Light-emitting diode, which means that the diode has the function of emitting light when it is powered on. An IR LED is a light-emitting diode, but its light is infrared light and is invisible.

(2) Do LEDs produce red light?

Yes, Using light-emitting diode (LED) arrays, the proportion of red light can be between 0% and 100%. Many commercial LED luminaires developed for plant growth applications emit a large percentage of red light, with 75% to 85% of the spectrum typically emitted in the red region.

(3) Do normal lights emit IR?

Yes, since the main source of infrared radiation is heat or thermal radiation, any object with a temperature will radiate in infrared. Incandescent light bulbs, for example, also produce a lot of infrared radiation.

(4) Are infrared LEDs visible?

850nm IR as "light" is invisible to the human eye, but it does produce a slightly reddish glow at the LED light source. 940nm is completely invisible!




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