Double-clap to toggle the light. https://youtu.be/0-Un6Gu4Ah0

ClapLED.ino

bool isOn = false;

void setup() {
  pinMode(2, OUTPUT);
  digitalWrite(2, isOn ? HIGH : LOW);
}

int th = 40;

void toggle() {
  if (isOn) {
    isOn = false;
    digitalWrite(2, LOW);
  } else {
    isOn = true;
    digitalWrite(2, HIGH);
  }
}

void loop() {
  if (analogRead(A2) > th) {
    delay(200);
    if (analogRead(A2) > th) {
      delay(1000);
      return;
    }
    for (int i = 0; i < 2000; i++) {
      if (analogRead(A2) > th) {
        toggle();
        delay(1000);
        return;
      }
    }
  }
}