youtor.org
Power LED Spectrum Testing
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=4i9cdbNPxL0
===================[ 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.
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