Arduino flickering LED

I wrote this a long time ago for someone who disappeared. Hope it’s useful to you.

int ledPin1 = 9;
int ledPin2 = 10;
int ledPin3 = 11;

#define THRESHOLD 90
#define FLICKER 250
#define OFFSET 5;
#define DLY 100

int _levels[] = {0,0,15,10,15,20,25,30,50,75,100,500,700,1000};

void setup()
{
}

void loop() 
{
    int len = sizeof(_levels)/sizeof(int);
    int level1 = _levels[random(len-1)];
    
    analogWrite(ledPin1, level1);
    if (level1 > THRESHOLD)
    {
 //      analogWrite(ledPin2, random(FLICKER));
    }
    else
    {
  //      analogWrite(ledPin2, 5);
    }
    
    //analogWrite(ledPin3, random(FLICKER)+OFFSET);
    delay(random(DLY));
}

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