Physics

Difference Between Red Light and Blue Light

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Main Difference

The main difference between Red Light and Blue Light is that Red Light is made up of rays of longer wavelengths, whereas the rays of Blue Light are of shorter wavelengths.

Red Light vs. Blue Light

Light is made up of particles or small packets known as photons that have different energies; photons of red light have low energy. On the flip side, photons of blue light have comparatively high energy.

Light rays with less energy contain long wavelengths, and the light rays with more energy have shorter wavelengths; so, it’s mean that red light is made up of rays of long wavelengths. On the other hand, the blue light has a short wavelength.

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Higher the energy of the light rays, the higher will be their frequency. So, red light has a low frequency, while the blue light has more frequency.

Red light therapies are used to cure multiple skin issues that stimulate the production of ATP and make the skin clearer, brighter, and tighter. On the flip side, blue light therapy kills harmful bacteria in the skin and prevent acne and other imperfections.

Comparison Chart

Red LightBlue Light
The light rays that have a higher wavelength and appear red in color are known as red light.The light rays of the low wavelength that appears blue in color are known as blue light.
Wavelength
Red light has a longer wavelength, i.e., 625–740 nm.Blue light has a shorter wavelength, i.e., 450–485 nm.
Frequency
Red light has a low frequency, i.e., 405–480 THz.Blue light has a higher frequency, i.e., 620–680 THz.
Energy
Red light has less photon energy, i.e., 1.65–2.00 eV.Blue light has high photon energy, i.e., 2.64–2.75 eV.
Laser
The red light laser is comparatively cheap.A blue light laser is comparatively expensive.
Skin Therapy
Red light therapy stimulates the formation of ATP and makes the skin clearer, brighter, and tighter.Blue light therapy kills harmful bacteria in the skin and prevents it from acne and other imperfections.
Role in Plant Growth
It plays an important role in the formation of flowers, the production of fruits, germination of the seed, growth of root, and bulb development.It plays its role in the production of chlorophyll and makes the stem and leaves, healthy and strong.
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What is Red Light?

Red light is the light rays that fall in the visible spectrum (that can be seen with the naked eye). It has a longer wavelength, i.e., 625–740 nm. Due to an inverse relationship present between frequency and wavelength, it has a low frequency, i.e., 405–480 THz.

Wavelength and energy of the photons also show an inverse relationship between them. So, as the red light has a higher wavelength so, it has low energy photons, i.e., 1.65–2.00 eV.

Red light is vital for photosynthesis in plants. It plays an important role in the formation of flowers and the production of fruits. It is essential for the early life of the plant. It plays its role in the germination of the seed, growth of root, and bulb development.

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Moreover, it is also used as therapy for skin. 100% UV free red light therapy lamps have been made that are powered by LED technology. During this treatment, red light penetrates deep inside the essential building blocks of the body. It Boosts the collagen production and blood flow and stimulates or activates the production of ATP that makes the skin tighter, clearer, and brighter.

This red light therapy does not have any downtime or side effects. Regular treatment may stimulate natural skin healing. Recommended time for treatment vary from patient to patient, but the average recommended time is three times a week for three months.

What is Blue Light?

Blue light also falls in a visible spectrum. It has a shorter wavelength, i.e., 450–485 nm. Due to the inverse relationship between frequency and wavelength, it has a higher frequency, i.e., 620–680THz. Blue light has a high energy photon, i.e., 2.64–2.75 eV due to the inverse relationship between energy and wavelength.

As blue light has short wavelengths and high energy so, its rays scatter more easily when striking with water and air molecules in the atmosphere. This high degree of scattering makes the sky look blue.

Sunlight is the leading source of blue light, but there are many manmade sources too. Examples are flat-screen televisions, display screens of electronic devices, fluorescent and LED lighting, etc. These devices release only a fraction of blue light as compared to that released through the sun.

It is the part of the visible spectrum that has the highest energy and shortest wavelength with both dangers and benefits.

The internal structure of the adult human eye is active for blocking UV rays from reaching that part of the human eye, which is light sensitive, i.e., the retina at the back of the eyeball. Even without sunglasses, only less than one percent of ultraviolet radiation reaches the retina from the sun. But, the human eye cannot block blue light. Almost all the blue light passes through internal structures of the eye and reaches the retina.

So, excess use of devices that emit blue light may cause serious eye problems. Health care professionals and eye doctors are concerned about the long term effects of blue light.

Its long term exposure may also cause muscular degeneration that may cause permanent loss of vision. Blue light also has many benefits. It is essential for plants. It plays a significant role in the production of chlorophyll. A plant with an excess of blue light will have a healthy and strong stem and leaves.

Blue light is also used as a therapy to cure skin problems. It penetrates into the pores of the skin and eliminates bacteria. Some bacteria are helpful, but others cause oil production and many other blemish-causing conditions. Blue light stimulates chemicals that are present inside these bacteria. These chemicals rupture their outer walls to destroy the cell and their capability to make acne and many other imperfections.

Many problems like Rosacea, wrinkles psoriasis, and sun damage may be treated through Blue Light Therapy. Its treatment also varies from patient to patient, but the average recommended period of treatment is two times a week for three months.

Key Differences

  1. The light rays that have a higher wavelength and appear red in color are known as red light whereas, the light rays of the low wavelength that appears blue in color are known as blue light.
  2. The rays of red light have a longer wavelength, i.e., 625–740 nm. On the other hand, blue light rays have shorter wavelengths, i.e., 450–485 nm.
  3. As there is an inverse relationship between frequency and wavelength, so red light has a low frequency, i.e., 405–480 THz conversely, blue light has a higher frequency, i.e., 620–680 THz.
  4. As there is also an inverse relationship between the wavelength and the energy of the light rays so, red light has less photon energy, i.e., 1.65–2.00 eV. On the flip side, blue light has high energy photons, i.e., 2.64–2.75 eV.
  5. The red light laser is comparatively cheap. On the other side, the blue light laser is comparatively expensive.
  6. Red light therapy stimulates the formation of ATP and makes the skin clearer, brighter, and tighter, while Blue light therapy kills harmful bacteria in the skin and prevents it from acne and other imperfections.
  7. Red light plays an important role in the formation of flowers, production of fruits, germination of the seed, growth of root, and bulb development, whereas blue light plays its role in the production of chlorophyll and makes the stem and leaves, healthy and strong.

Conclusion

The above discussion summarizes that Red Light and Blue Light fall in the visible spectrum. Red Light is a light of high wavelength and low energy. On the other hand, Blue Light has a small wavelength and high energy.

Harlon Moss

Harlon currently works as a quality moderator and content writer for Difference Wiki. He graduated from the University of California in 2010 with a degree in Computer Science. Follow him on Twitter @HarlonMoss

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