int led[] = {13,12,11,10,9,8,7};
int t = 200;
int jlh = 8;

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

void loop() {
  // put your main code here, to run repeatedly:
for (int a = 0; a < jlh; a++) {
  digitalWrite(led[a], HIGH);
  delay(t);
}
}