Light control switch circuit 3 controlled by flashlight

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It uses photosensitive resistors RG1 and RG2 as detection components, and transistors as control and switching
functions.
    When the power is turned on, the relay KA is closed and the load is turned on. When the flashlight shines on the photoresistor RGz, KA is released
and the load is cut off. To start up (connect the load), you can use a to shine on the photoresistor RG.     Resistors Rl and R2 play the role of stabilizing the operating points of transistors VTi and VTz respectively. By adjusting Ri and R2, the sensitivity of RG1 and RGz can be adjusted respectively.