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are high light levels or low temperature a consideration?
For the purpose of photomultiplier selection, high light levels are defined in terms of the magnitude of the expected photocurrent or, more directly, in relation to the sensitivity of the human eye.
If you can see the light, no matter how faint, then you are dealing with high light levels! Equivalently, if photocathode current is greater than 1 nA then light levels are high.
The current carrying capacity of a photocathode is dependent on the operating temperature, their rankings, at 20 ºC, are given in the table below. All become less conductive with decreasing temperature.
Further information is available in our photomultiplier brochure, request a copy via this form.