In the LI-190 PAR quantum sensor (PAR = photosynthetically active radiation)
colored glass filters are used to tailor the silicon photodiode response
to the desired quantum response.
The LI-200SA features a silicon photovoltaic detector.
This is not a true 'pyranometer' and should be used only in sunlight, and
calibrated in sunlight.
The LI-210SA Photometric Sensor utilizes a filtered silicon photodiode to provide
a spectral response that matches the CIE curve within <U+00B1> 5