Automatic night light using PNP transistor and photoresistor(LDR)

Below is the schematics diagram.

schematics drawing and some calculations.

The R1 controls the sensitivity of the circuit. If R1 is small, like 10k ohm, a little darkness will activate the LED.

An easier way is to replace R1 with a trim pot (100k ohm)as a rheostat, to get the wanted brightness and sensitivity.

Below, circuit on perforated board.

During bright, LED off.
Cover LDR with finger, LED on.

A video in normal lighting and in the dark.