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UPDATE 2025: I'm still building and selling these. I stopped adding great feedback because there's so much already - every one of which is entirely genuine. You're still welcome to order your instrument today. http://chriswesley.org/spectrometer.htm ===================[ STOP PRESS: ]=================== I designed and now make a production HD Spectrometer you can buy. Visit the sales page here: http://chriswesley.org/spectrometer.h... ===================[ STOP PRESS: ]=================== My spectrometer was homemade based on guidance form the excellent Theremino project which you can find here: http://http://www.theremino.com. These guys also wrote the excellent software which you see being used here. I use my home made spectrometer to see the spectra of the power LEDs I bought for a grow lamp I'm building. Learning points: 1. All LEDs are around half the advertidsed 3 watts power. The sellers says this is "industry standard". Oh, I guess that's OK then, is it? 2. As you increase the current up to the rated maximum 700mA, the wavlength of these LEDs increases. 3. As these LEDs get hot, their central wavelength also increases. 4. The advertised wavelengths are not accurate. All 16 of my red LEDs were 10nM short of the advertised 60nM. My blue 440 LED was 435, my blue 470 LED was 451. My "White 4500K" LED should have a spectral peak at 66nM but it is actually at 534 - a massive 126nM off.