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Do you have any insight on how to take spectroscopy measurements at home on a <1k€ budget? And how to select an LED manufacturing supplier when CRI is often the

Do you have any insight on how to take spectroscopy measurements at home on a <1k€ budget? And how to select an LED manufacturing supplier when CRI is often the only thing available on the datasheet?

reaperman 2y ago
Starting points for first question: Look into i1Pro (later models of the first generation), which can be had for $200-400. Combine with some free or $99 Windows/Mac/Android software [0] [1]. Second question: It is still too hard even to find CRI for most offerings. It's pretty much a "buy, test, return the ones you don't like" situation. If independent reviewers start publishing spectrograms and making YouTube/etc videos, perhaps the industry will move forward some day. 0: https://www.argyllcms.com/doc/instruments.html#i1p2 https://www.argyllcms.com/doc/instruments.html#i1p2 1: https://rmimaging.com/spectrashop_brochure.pdf https://rmimaging.com/spectrashop_brochure.pdf
alejohausner 2y ago
The luxeon 2835 website that’s linked in the article has a data sheet for the LED source. Scroll down and you’ll see the spectra for various subtypes of that source.
mac-mc 2y ago
A little garden spectrometer is pretty good, and around $60: https://www.youtube.com/watch?v=LxQmaJYMOAk https://www.youtube.com/watch?v=LxQmaJYMOAk . And the LED supplier should give a spectrometer graph. If you can get a dual peak LED that will give a better spectrum distribution. The Amaran 200x S is one of the best.
- fouronnes3 2y ago
  Very cool! I definitely want a spectrometer at home now! edit: looks like it's more of a DIY project than a commercial thing. Maybe DIY spectrometer is my next project then!
  - 4gotunameagain 2y ago
    Mid level, $750: https://www.aseq-instruments.com/LR1.html https://www.aseq-instruments.com/LR1.html Entry (?) untested, $350: https://thunderoptics.fr/product/sma-e-spectrometer/ https://thunderoptics.fr/product/sma-e-spectrometer/
  - mac-mc 2y ago
    I bought a little garden on aliexpress from the guy who makes it. It's very plug and play and it does about 350-1100nm, which is pretty impressive. I used it to verify how my own DIY sun reproduction setup works. https://www.aliexpress.us/item/3256807055520087.html https://www.aliexpress.us/item/3256807055520087.html There is also this commercial one that is Bluetooth and more portable for around $150, similar spectrum range but lower spectrum resolution than the little garden one. https://www.youtube.com/watch?v=MOXryggwr_Q https://www.youtube.com/watch?v=MOXryggwr_Q https://www.amazon.com/Analytical-Wavelength-340-1000nm-Spectrometer-Measurement/dp/B0DK1QXSD1 https://www.amazon.com/Analytical-Wavelength-340-1000nm-Spec... The hopocolor vis light ones are also fairly widespread and are more stand alone for about $280: https://www.aliexpress.us/item/3256807972511960.html https://www.aliexpress.us/item/3256807972511960.html My current issue is finding a 250-400nm UV spectrometer or IR spectrometers beyond 1000nm that don't go into the $1000+ range. Standard mass market CMOS sensors don't go into those ranges, so they become far more specialized parts and thus way more pricy.

reaperman 2y ago

Starting points for first question: Look into i1Pro (later models of the first generation), which can be had for $200-400. Combine with some free or $99 Windows/Mac/Android software [0] [1]. Second question: It is still too hard even to find CRI for most offerings. It's pretty much a "buy, test, return the ones you don't like" situation. If independent reviewers start publishing spectrograms and making YouTube/etc videos, perhaps the industry will move forward some day. 0: https://www.argyllcms.com/doc/instruments.html#i1p2 https://www.argyllcms.com/doc/instruments.html#i1p2 1: https://rmimaging.com/spectrashop_brochure.pdf https://rmimaging.com/spectrashop_brochure.pdf

alejohausner 2y ago

The luxeon 2835 website that’s linked in the article has a data sheet for the LED source. Scroll down and you’ll see the spectra for various subtypes of that source.

mac-mc 2y ago

A little garden spectrometer is pretty good, and around $60: https://www.youtube.com/watch?v=LxQmaJYMOAk https://www.youtube.com/watch?v=LxQmaJYMOAk . And the LED supplier should give a spectrometer graph. If you can get a dual peak LED that will give a better spectrum distribution. The Amaran 200x S is one of the best.

fouronnes3 2y ago
Very cool! I definitely want a spectrometer at home now! edit: looks like it's more of a DIY project than a commercial thing. Maybe DIY spectrometer is my next project then!
- 4gotunameagain 2y ago
  Mid level, $750: https://www.aseq-instruments.com/LR1.html https://www.aseq-instruments.com/LR1.html Entry (?) untested, $350: https://thunderoptics.fr/product/sma-e-spectrometer/ https://thunderoptics.fr/product/sma-e-spectrometer/
- mac-mc 2y ago
  I bought a little garden on aliexpress from the guy who makes it. It's very plug and play and it does about 350-1100nm, which is pretty impressive. I used it to verify how my own DIY sun reproduction setup works. https://www.aliexpress.us/item/3256807055520087.html https://www.aliexpress.us/item/3256807055520087.html There is also this commercial one that is Bluetooth and more portable for around $150, similar spectrum range but lower spectrum resolution than the little garden one. https://www.youtube.com/watch?v=MOXryggwr_Q https://www.youtube.com/watch?v=MOXryggwr_Q https://www.amazon.com/Analytical-Wavelength-340-1000nm-Spectrometer-Measurement/dp/B0DK1QXSD1 https://www.amazon.com/Analytical-Wavelength-340-1000nm-Spec... The hopocolor vis light ones are also fairly widespread and are more stand alone for about $280: https://www.aliexpress.us/item/3256807972511960.html https://www.aliexpress.us/item/3256807972511960.html My current issue is finding a 250-400nm UV spectrometer or IR spectrometers beyond 1000nm that don't go into the $1000+ range. Standard mass market CMOS sensors don't go into those ranges, so they become far more specialized parts and thus way more pricy.