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need data-point: count rate of APD (avalanche photo-diode) for specific aperture and stellar magnitude

I hope lab / experimental physics is fair game for this web-site. If not, sorry! I'm designing a sensor system to perform specialized [astronomy and space-sciences] experiments, and need a "reality ...
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How does the Luminosity Function relate to the tristimulus sensitivity function?

In colorimetry, the irradiance spectrum is weighted with the luminosity function to obtain the perceived luminosity, and the tristimulus sensitivity functions to obtain the perceived ...
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Galactic flux given magntiudes

Introduction I have the following data for a galaxy: apparent magnitude in $U,B$ and $V$ Johnson photometric system: $$m_{U}=17.51 \\m_{B}=17.08 \\m_{V}=16.74 $$ The galaxy is such that the ...
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Photometric versus radiometric and spectral quantities

Are spectral quantities the same as photometric quantities? How do you pass from a radiometric quantity $R$ to the correspondent spectral quantity $R_λ$ I've been ask to pass from Irradiance to ...