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800nm 810nm 820nm wavelengths are all near IR light. 810nm integrated with LED diodes and you can see a faint glow. 810nm red light is a very light pink color.

850nm is a wavelength of light that lies in the near-infrared spectral range (800nm~1500nm), and this band of light is invisible to the human eye. So you can't see with your naked eye whether the 850nm LED strip or light is working or not. But you can see the 850nm LED light beads emitting a faint pinkish reddish dimming light under the cell phone camera and other devices.

The MTF curve of a lens assembly shows the degree to which the system can transfer contrast from the object to the image plane at different spatial frequencies.

The radiation intensity of 850nm is about 2-3 times higher than that of 940nm, so 850nm infrared light will be a bit brighter. Therefore, 850nm will have a red burst situation, LED chip will appear visible red dot in the work, 940nm is not have. This can be a disadvantage in infrared lighting applications, but in some cases this visibility can help to confirm the operational status of the IR led strip.

660nm is visible light, referring to red light with a wavelength of 660 nanometers. When 660nm light is emitted from a light source, our eyes are able to see a distinct reddish glow. The wavelength range of red light is between 620nm and 750nm, with 630nm 640nm 660nm and 730nm all showing red light.

Moreover, the light of 810nm LED strip, 850nm LED strip, and 940nm LED strip is invisible to the human eye, so this IR LED strip type is usually used for lighting that needs to be unnoticed.

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Images and videos use specific transfer functions to describe the relationship between electrical signal, scene light and displayed light.

In the visible light spectrum, the wavelength of red light ranges from about 620nm to 750nm. Compared to 660nm bright deep red light, 730nm far red light is closer to the boundary of infrared light.

Our infrared (IR) and near-infrared (NIR) light led strips are available in 660nm, 730nm, 810nm, 850nm, and 940nm wavelengths. These wavelengths are often used in light therapy (photobiomodulation therapy), plant growth, and night vision systems for security cameras.

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Both 940nm and 850nm near infrared light are invisible and both can be used in night vision systems. The difference is that 940nm is almost completely invisible to the naked eye and cell phone cameras, therefore 940nm is better suited for surveillance scenarios where concealment is required.

In plant growth, red light around 660nm has a significant effect on photosynthesis, especially under certain 500nm blue light conditions, which can promote plant growth and flowering. Sometimes 660nm mixed with 3000K/3500K warm white light is also chosen to help vegetable growth.

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660nm belongs to visible light, the color is deep red; while 850nm belongs to invisible light, which can only be seen under the camera equipment. 850nm wavelength is more powerful than 660nm wavelength to penetrate the tissue, and able to reach the deeper tissues of the body. Therefore, 660nm wavelength light is commonly used for surface skin problems and cosmetic issues, while 850nm wavelength light is more suitable for deeper tissue treatments.

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LED lights can emit 660nm red color light, SMD2835, SMD3528, and SMD5050 can do red light. Using these low voltage DC 12V or 24V deep red 660nm led light strips for light therapy can promote cell regeneration and repair, anti-inflammation, improve blood circulation, reduce pain, and promote wound healing. LED 660nm red light therapy has a positive effect on both skin health and mental health.

Near infrared light strip emits longer wavelengths (700nm to 1400nm) than red light, which allows 730nm, 810nm, 850nm, and 940nm to penetrate deeper into our body to help detoxify, reduce inflammation, and relieve pain.

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• 850nm led light: It is infrared light and is not visible to the naked eye. Although called infrared light, 850nm LEDs emit infrared light along with a weak visible red light.

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The 810nm wavelength has strong tissue penetration ability and can penetrate deep into the skin tissue and reach the target treatment area, often used in sauna applications and photobiomodulation therapy. Beneficial for improving depressive symptoms, enhancing muscle performance and post-exercise recovery, promoting lymphatic drainage, antibacterial and anti-inflammatory, and blood circulation.

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660nm deep red led strip is visible red light (620nm to 700nm). This red light therapy acts on the skin surface (penetrating your body to a depth of about 8 to 10 mm) to stimulate cell regeneration (collagen) and can treat skin conditions such as acne, wrinkles, and age spots, and heal wounds.

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940nm wavelength is located in the infrared lights spectral range, invisible to the naked eye. 940nm invisible infrared technology is widely utilized in applications such as night vision devices, remote controls, security cameras, and other applications to provide clear night vision while maintaining surveillance invisibility. The 940nm IR light has a good transmission capacity in the atmosphere, which makes it suitable for long-distance transmission and telephoto shooting.

• 940nm led light: It also belongs to infrared light, which is not visible to the naked eye. Compared with 850nm LEDs, 940nm LEDs emit light at a minimum wavelength at which the intensity of the light it emits reaches a value of 0 is higher than the visible long wavelength of 760nm, so the light emitted by 940nm LEDs is not visible to the human eye.

In agriculture, 660nm red light led strip and 730nm far-red led strip are used in plant growth lighting systems to promote plant photosynthesis.

The 850nm near infrared light waves have significant applications in the field of phototherapy. 850nm red light therapy penetrates deep into the skin and is absorbed by the water, proteins and pigments in the tissues to generate heat energy. This heat energy stimulates circulation, increases cellular activity, and acts as an inhibitor of inflammation and pathological tissue.

730nm light promotes shade avoidance, makes plants taller, and regulates flowering cycles. This wavelength of red light also penetrates deeply into the plant canopy, which enhances photosynthesis and is especially beneficial for ornamental flowers.

by CG Galbraith · 2011 · Cited by 323 — Defining super resolution. The resolution limit of conventional light microscopy is ~250 nm in the x and y direction, and >450–700 nm in the z direction.