Can you give a link to where you bought your BH1750 module ? Some modules have level shifters for I2C, other modules don't have level shifters but they do have a voltage regulator.
When you have that module that is shown in that video and in that link you gave, then I suggest to connect the Arduino 5V pin to VCC of the module. Then it should work. You don't have to connect the ADD pin and you don't have to add extra pullup resistors.
Do you use a breadboard ? They often have bad contacts.
Always start with the I2C Scanner. When the I2C Scanner can not see the sensor, then you don't even have to try a library or a sketch.