Simple Circuit Experimentation

In this project, I use 2 LED's and a photoresistor to make a simple circuit that mimics cop light patterns. When there is more light present to the photoresistor the lights flash quicker.

BREADBOARD:

CODE:
The method I used to get the photoresistor to change the speed of the flashes was to make the blinkDelay variable map the light value within a specific range. When the light is mapped it can be fine-tuned to the correct range of blinkDelay values you want.
The only issue I found was that the blinks would not gradually get faster, but it would quickly change its blink delay after it went through a cycle. So in essence, when a light is flashed on the photoresistor it would finish its cycle then update to the shorter blink delay.
This can be seen in the video above.

//Constants
const int pResistor = A0; // Photoresistor at Arduino analog pin A0

//Variables
int LED1 = 8;
int LED2 = 12;
int blinkDelay;
int lightVal;

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  Serial.begin(9600);
}

// the loop function runs over and over again forever
void loop() {
  lightVal = analogRead(pResistor);
  blinkDelay = map(lightVal, 200, 700, 400, 100);
  Serial.println(lightVal);
    for(int x = 0; x < 2; x++) {
      digitalWrite(LED1, HIGH);   // turn the LED on (HIGH is the voltage level)
      delay(blinkDelay);
      digitalWrite(LED1, LOW);
      delay(blinkDelay);
    }
    delay (blinkDelay);
    for(int x = 0; x < 2; x++) {
      digitalWrite(LED2, HIGH);
      delay(blinkDelay);                       // wait for a second
      digitalWrite(LED2, LOW);    // turn the LED off by making the voltage LOW
      delay(blinkDelay);                       // wait for a second
    }
  }