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Hello Jim,
For the experiments, take one (Photo diode/transistor, LDR, ambient light sensor) with a wide viewing angle (somewhat over 90 degrees). Measure the response also for a filament lamp, fluorescent tube/lamp, white LED lamp and sun under low elevation angle. You may also experiment with white plastic as a diffuser. It reduces sensitivity, but increases viewing angle when using narrow viewing angle photo diodes/transistors.
Compare the values with you own eye perception.
Good luck with the experiments and best regards,
Wim PA3DJS