What is the "collector light current" of a phototransistor and how does it relate to the collector current?
Ica (what they are the &quot;collector light current&quot;) is the current through the collector and out the emitter vs. Vce (collector to emitter voltage) at different intensity of light impinging on the device.
So, for example, if you had a Vce of 10V and shined a light of 0.1 mW/cm2 on it, you should expect an Ica of about 0.3 mA (more or less).