int lampu[] = {1, 2, 3, 4, 5};
int numLeds = 5;

void setup() {
  // put your setup code here, to run once:
for (int i = 0; i <= numLeds; i++ ) {
pinMode(lampu[i], OUTPUT);
}
}

void loop() {
  // put your main code here, to run repeatedly:
for (int i = 0; i <= numLeds; i++) {
  digitalWrite(lampu[i], HIGH);
  delay(500);
  digitalWrite(lampu[i], LOW);
  delay(500);
}
}