I was looking through photocell (photoresistors) datasheets, like for instance the NORPS-12, especially the graphic on resistance value versus light intensity.
In no datasheet could I find information on the accuracy, due to the manufacturing process (that is between different single component of the same type, say different NORPS-12 photocells.)
The only information I found from a blog was: "can vary quite a bit from photocell to photocell (perhaps as much as 50%.)" That is quite a lot.
- Why is this information never(?) provided?
- What is the typical variation between single components? 50% variation of the resistor values for the same light intensity, really?
- Are there photocell types whose variability is less than others?
- Does it imply that each photocell has to be calibrated for each device with respect to light measurement applications?
Thank you very much fo sharing your experience and knowledge about this issue.