the LED itself turns on in the dark

We need the following components:

one LTR-4206E phototransistor one lithium CR2032 battery (3 V) 2N3904 transistor 1 K resistor

Photos of these components:

Progress: First, take the Transistor and resistor and solder them as shown in the figure:

Next, solder a phototransistor to this design:

Next, we attach the LED:

And then the power source:

And now we look at what we got:

This light will turn on when it gets dark