UVA - 320-400 nm; UVB - 290-320 nm; UVC - 200-280 nm.
UVA are used for UV curing, nail polish dryer, grow lighting, trap insects, detector for checking counterfeit(such as jewelry, currency art etc.), photocatalyst and other UV sensitive materials through polymerization and so on.
UVB rays are the part of sunlight that gives one sunburn. Carefully controlled, it is an extremely effective tool for significant skin disease.
UVC are widely used for sterilizing in hospitals, air conditioning systems, disinfection cabinets, water treatment equipment, water dispensers, sewage treatment plants, swimming pools, food and beverage processing and packaging equipment.
Studies show that the body is affected in different ways by different wavelengths. The most effective, health giving wavelengths of red light, are in the ranges of 630 to 670nm for red light and 810 to 880nm for near-infrared light, which is incredibly effective in stimulating better nutrient circulation in the body for maximum cell performance. Which means your whole body will be operating at peak performance, aka being healthy.
Answer: LED backlight is most popular in modern TVs. Itis subdivided into Direct LED and Edge LED. Direct LED uses LEDs behind the matrix across its surface, and Edge LED uses LEDs along the perimeter of its side surface. In this case, the light falls on a special splitter, then redirected to the diffuser and dissipates over the surface of the matrix.
SMD LED stands for surface mount LED. Specifically, it's a light-emitting diode that is mounted onto and soldered onto a circuit board. An SMD LED is quite small since it has no leads or surrounding packaging that comes with a standard LED. This means it's best handled, not by a human, but by automated assembly equipment.Based on the same power consumption, SMD LED produce the highest brightness among other types of LED packages with highest efficiency. Additional, the SMD LED produce very little heat while has relatively high output lumen since it is driven by a low voltage and current.
Blue Light - The most important blue wavelengths are from 439 to 469 nm. This part of the spectrum is also known as cool light. These wavelengths encourage vegetative growth through strong root growth and intense photosynthesis. Blue light is often used alone during the early phases of plant growth, such as starting seedlings, when flowering is not desired.
Red Light - The longer wavelengths of light are red in color. The most important wavelengths in the red spectrum are from 640 to 680 nm. These wavelengths encourage stem growth, flowering and fruit production, and chlorophyll production. The red wavelengths are known as warm light, and they are naturally more prevalent in sunlight during the shorter days of fall and winter.
Far Red Light - Although the 730nm wavelength is outside the photosynthetically active range, it has the strongest action on the far-red absorbing form of phytochrome, converting it back to the red-absorbing form. Plants requiring relatively low values of the phytochrome photoequilibrium to drive the flower cycle. The 730nm wavelength can be used at the end of each light cycle to promote flowering in short-day plants such as Cannabis.
CRI is the average value of R1 to R15. R1: light greyish red, R2: dark greyish yellow, R3: strong yellow green, R4: moderate yellowish green, R5: light bluish green, R6: light blue, R7: light violet, R8: light reddish purple, R9: strong red, R10: strong yellow, R11: strong green, R12: strong blue, R13: light yellowish pink(skin), R14: moderate olive green(skin), R15: asian skin.
Answer: CRI is a measure of how complete the colour spectrum is in a beam of white light, and how well colours will be represented when illuminated by that light. The higher the number the better.