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The original LED available to the group was the blue QT Optoelectronics MV5B60. The calibrating this device with the HPD showed a very long decay of its pulse. Several more devices with larger wavelengths were procured and measured settling on a yellow LED (Fairchild MV8304) for its speed. The SiPMs were characterized with respect to one another and the HPD using this device. With a mean wavelength of about 590nm, this LED is near the peak of the SiPM detection spectra.
The original LED available to the group was the blue QT Optoelectronics MV5B60. The calibrating this device with the HPD showed a very long decay of its pulse. Several more devices with larger wavelengths were procured and measured settling on a yellow LED (Fairchild MV8304) for its speed. The SiPMs were characterized with respect to one another and the HPD using this device. With a mean wavelength of about 590nm, this LED is near the peak of the SiPM detection spectra.