3W 400nm UVA LED Chip

Item Name: 3W 400nm UVA LED Chip

Model Number: GP-3WUVA-G45

Input Current: 700mA

Power: 3W 

Input Voltage: 3-3.8VDC

LED package type: High Power K1 package

Chips brand: Taiwan Epileds 

Emitting Power: 800-1200mW

Color: 395-405NM

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Note:

The following is intended as a valuable introduction to UV (ultraviolet) for newcomers and enthusiasts alike.

Ultraviolet light is that portion of the electromagnetic spectrum that lies beyond the “purple†edge of the visible spectrum and has wavelengths between 100 and 400 nm. The UV spectrum is further divided into ranges as follows:

Range NameWavelength Range / nm

  

UVA315 - 400

UVB280 -315

UVC200- 280

Vacuum UV100 -200

The UVA range causes sun tanning in the human skin. The UVB range causes sun burning. The UVC range is absorbed by DNA and thus can cause cancer and mutations. This is also the range that is most effective in inactivating bacteria and viruses. The Vacuum UV range is absorbed strongly by water and air and thus can only be transmitted in a vacuum.

Ultraviolet photons are particularly energetic and when absorbed in molecules can cause bonds to be broken (photochemistry).

UVA LED application:

UV curing for the printing machines:

UV curing (ultraviolet curing) is the process by which ultraviolet light is used to initiate a photochemical reaction that generates a crosslinked network of polymers. UV curing is adaptable to printing, coating, decorating, stereolithography, and in the assembly of a variety of products and materials. In comparison to other technologies, curing with UV energy may be considered a low temperature process, a high speed process, and is a solventless process, as cure occurs via direct polymerization rather than by evaporation.

What is a "photon"?

Ultraviolet light (along with all others forms of electromagnetic radiation) comes in discrete energy packets called "photons". The energy of a photon is given by:

U = hn = hc/l

where h is the Planck constant (6.626755 x 10-34 J s), c is the speed of light (2.997925 x 108 m s-1), n is the frequency (Hz) of the light, is the wave number (cm-1 or m-1) of the light and l is the wavelength (nm or m). Usually photochemical "events" involve absorption of only one photon per molecule.

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