The lighting industry event Guangzhou Lighting Fair has ended for a month. The highlights of this year’s Guangya Fair are smart lighting, landscape lighting, plant lighting, full spectrum LED light, and healthy lighting. We have mentioned healthy lighting many times, and “lighting should be people-oriented” has become the consensus of the industry. Manufacturers are no longer just pure light effects or service life, but consider people’s perception of light and the impact of light on people, hoping to create artificial light closer to natural light.
Natural light is the “sunlight”. 5000 years ago, people mainly relied on natural light for sunrise and sunset. With the development of the electric power industry in the 19th century, the first artificial light appeared, and then artificial light experienced incandescent lamps, fluorescent lamps… …To the present LED…People have been chasing the artificial light that is closest to sunlight. With the maturity and development of LED technology, the manufacture of full spectrum LED light similar to the solar spectrum has become a hot spot in the industry in recent years.
Full spectrum LED light and sunlight
Full spectrum refers to the light whose spectrum is similar to that of sunlight. The full spectrum should include infrared, visible, and ultraviolet spectra, and the proportion of light content in the spectrum is similar to that of sunlight. The color rendering index Ra of full spectrum light is close to 100. The light intensity of sunlight changes with the change of morning, evening, and four seasons, and the temperature changes with the change of morning, evening, and four seasons. The spectrum of full spectrum LED lamp simulates sunlight, and it can also change the light intensity and adjust the color temperature with the change of morning, evening, and four seasons, so as to serve the growth law of organisms.
The continuous spectrum of solar radiation at noon on a sunny day, with a color temperature of 5000K, is divided into two parts: visible light and invisible light. Visible light has a wavelength of 400~760 nm, which is divided into 7 colors of red, orange, yellow, green, cyan, blue, and violet, which is concentrated into white light; two kinds of invisible light, infrared light with a wavelength greater than 760nm and ultraviolet light with a wavelength of 290-400nm. The full spectrum LED should simulate the 5000K solar spectrum as much as possible.
The blue light spectrum of ordinary LEDs is relatively high, lacking purple light, cyan light, short-wave green light, and long-wave red light. At present, full-spectrum LEDs are realized by chip + phosphor. By adding a purple light chip or adding a blue peak and phosphor peak. Phosphors with wavelengths in the recessed region complement the spectrum.
Color rendering refers to the characteristics of different colors when light sources of different spectrums are illuminated on objects of the same color. The color rendering index (Ra) is usually used to express the color rendering of the light source. The higher the color rendering index of the light source, the better it’s color rendering performance. The color rendering of sunlight is 100. Fifteen sample colors are used to evaluate the color rendering of the light source. The special color rendering R9 is an indicator of the quality of reproducing vivid color red. Ra and R9 are both higher values, which are the performance of high-quality LEDs.Compared with ordinary LEDs, full-spectrum LEDs have a more continuous spectrum and a wider color gamut; the color rendering index Ra is greatly improved, closer to 100; among them, the special color rendering index R9 can be as high as 90 or more.
Features of full spectrum LED light
The full-spectrum LED greatly enhances the continuity and integrity of the spectrum by complementing the missing short-wave violet, cyan, short-wave green, and long-wave red light spectra, making the color gamut wider and closer to the full spectrum of sunlight. Short-wave “violet light” helps the human body to synthesize vitamin D and promote the body’s absorption of calcium. The purple light with a wavelength of 400 to 420 nm also helps plants form anthocyanins and resist the elongation of branches and leaves. Long-wave “red light” can promote the overall growth of plants during the flowering and fruiting periods. The range of blue light in the ordinary LED spectrum is relatively large. Excessive blue light and improper use of lighting fixtures can cause visual damage. Blue light inhibits the secretion of melatonin, which may cause insomnia. Full-spectrum LED lights can not only effectively reduce the blue light hazards of lighting LED light sources.
Application of full spectrum lamps
Full-spectrum LED lights have full spectrum and good color rendering. These advantages make them have unique effects in many places. In addition, because full-spectrum LED lights are similar to sunlight, full-spectrum LED lights can be a good supplement to sunlight. In some places where sunlight is needed but not enough, full-spectrum LEDs are a good substitute for sunlight.
Plant lighting with full spectrum LED light
Different spectrums have different effects on plants. Full-spectrum lights can better promote the growth and development of plants. Plants have been constantly evolving and are now very adapted to survive in the sun. Many colors in the sun have different effects. Full-spectrum LED lights The spectrum is similar to sunlight, which can better promote plant growth and development.
280-315nm wavelength light: The wavelength of this frequency band is ultraviolet light. Ultraviolet light has the effect of killing bacteria and insects, but ultraviolet light also inhibits the growth of plants. Ultraviolet light is good for removing insects occasionally, but it cannot be used frequently on plants.
315-400nm wavelength light: The light in this frequency band is far-ultraviolet light. Plants absorb less far-ultraviolet light, and this light inhibits the growth of plant stems.
400-520nm wavelength light: The light in this frequency band is blue light, which has a greater impact on plants. Plants can absorb blue light for photosynthesis, and blue light can significantly promote plant growth.
Light of 520-610nm wavelength: The light in this frequency band is a green light, and plants do not absorb green light much. We usually see that many plants are green because plants absorb other colors and reflect green light. , So the plant looks green.
Light with wavelength of 610~720nm: The light in this frequency band is a red light. Red light has a significant impact on plants and can promote the growth of plants. Red light and blue light are the best light, so many plant lights are blue and red. Mixed-light of light.
720~1000nm wavelength light: The light in this frequency band is infrared, and plants rarely absorb infrared. Infrared light can promote plant seed germination and plant flowering.
Camera full spectrum LED light
Basically, the camera will be equipped with LED fill light, which is used for shooting at night and in dark environments. Without this kind of fill light, there will always be problems of whitening, skin tone, and object color completely deviating from the normal color. The full-spectrum fill light can complement all wavelengths and colors, making the skin color and color closer to the real thing.
Indoor lighting with full spectrum LED light
Full-spectrum LED lights have high Ra and good color rendering. They are very good indoor lighting. At night or in a room with insufficient light, using full-spectrum lights, indoor objects and environments will look fresher and more real. The full spectrum lamp is the solar spectrum familiar to the eyes, which makes the glasses very comfortable in the indoor environment and can effectively protect the glasses.
The use of full spectrum LED lights in other fields
In addition, full-spectrum LEDs are also used in areas that require high spectral quality, such as surgical lights, eye protection lights, museum lighting, and high-end lighting.
Current situation and development of full spectrum LED light
According to industry statistics, the current proportion of full-spectrum LEDs in the LED market is only about 2%. Compared with ordinary LEDs, full-spectrum LEDs cost slightly higher and are subject to price constraints and greater resistance to promotion.
Industry insiders predict: “With the continuous improvement of full-spectrum technology, users will appreciate the importance of full-spectrum light quality, and its market share will grow rapidly. The entire LED industry, especially the indoor lighting field, will also rapidly change from conventional Transition from high-color-rendering LEDs to full-spectrum LEDs.”
It is reported that while companies and scientific research institutions have joined hands to develop full-spectrum lamps, they have also developed a full-spectrum lighting system that can simulate changes in the color temperature of sunlight throughout the year and at different time periods in the morning and evening, which is more in line with the natural growth law of organisms.
Wisdom makes dreams, technology changes lives. The essence of LED lighting is to provide artificial light. The meaning of artificial light is close to natural light. With the continuous development and maturity of LED technology, it will definitely bring us a more comfortable light environment.