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UltravioletPhotography

Full spectrum LEDs?


enricosavazzi

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enricosavazzi

I am not talking about grow lights that use LEDs of multiple colors, but about "full spectrum" phosphor LEDs (either cobs or single-chip), where the phosphor emits in the range 380-850 nm.

 

They may have been around for a while, but only now I became aware of them. It should not be impossible to tweak the phosphor mix and get emission ranges starting at 365 nm. It might even be possible to use it as remote phosphor to convert the emission of mercury arc lamps into a continuous UV spectrum.

 

For examples:

https://www.electrokit.com/en/product/led-3w-fullspektrum-380-850nm-pa-kort/

https://www.alibaba.com/product-detail/100W-Full-Spectrum-Grow-LED-Chip_60193245216.html?spm=a2700.7724857.normalList.2.7b215682y7kEb2

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Yes many household LED lights in E26/E27 size use these. I know as I cut them open to add filters. Surprisingly to me is a lot of IR off them. Or our cameras are really good at IR.

I hould take a photo of the inside of some of my LED bulbs. Some brands also add a lens inside to redirect the light.

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enricosavazzi

The following link lists two phosphors that absorb the Hg line at 253,7 nm and emit in a band of 330-370 nm and 360-380 nm, respectively. So the phosphors are relatively easily available to make a remote-phosphor panel that emits pretty much across the whole UVA range and can be "pumped" with UVC from a mercury arc lamp.

 

http://www.mt-berlin...phosphor_uv.htm

 

There is also a US patent for pretty much the same thing, but the phosphor emission spectrum is restricted to UVB wavelengths useful for sterilization.

 

https://patents.goog...t/US20130289132

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