const byte sensorPin = A0, lampPin = 8;
const int darkLevel = 350, brightLevel = 450;
bool lampsOn = false;
void setup() {
  pinMode(lampPin, OUTPUT);
  digitalWrite(lampPin, LOW);
  Serial.begin(9600);
}
void loop() {
  int light = analogRead(sensorPin);
  Serial.println(light);
  if (light < darkLevel) lampsOn = true;
  if (light > brightLevel) lampsOn = false;
  digitalWrite(lampPin, lampsOn ? HIGH : LOW);
  delay(100);
}