I have data sheets for two PIN photodiodes. I would like to compare their sensitivities. One of them is specified in mw/cm^2 and the other is in lux.
I have tried to find a way to convert one to another, but it seems that the mw/cm^2 is radiometry terms and lux is a photometry term involving weighting due to the response of the human eye. I'm at a loss.
Here are the relevant data points (I think):
Diode 1 Vishay BPV22NF
80 uA at 1 mW/cm^2 at 950 nm
Diode 2 Sharp PD481PI
5 uA at 100 lux at 960 nm (actually, they say 5 uA at 100 lux using a CIE standard light source (tungsten lamp) but peak sensitivity is at 960 nm)
Any help comparing the relative sensitivities will be greatly appreciated.