Darkness to light

1void setup() {
2
3  Serial.begin(9600); 
4  pinMode(A5, INPUT);//  for taking input from photoresistor
5  pinMode(4, OUTPUT);//for the pin corresponding  to blue
6  pinMode(3, OUTPUT); //for the pin corresponding to green
7  pinMode(2,  OUTPUT); //for the pin corresponding to red
8}
9
10void loop() {
11  // put  your main code here, to run repeatedly:
12
13  int ledOutput = (analogRead(A5));  //output of LDR is assigned to ledOutput
14  
15  int ledO = map(ledOutput,  1, 1023, 0, 254); 
16  
17  Serial.print("Lightread");
18  Serial.println(ledO);       //read the output of the LDR on the serial monitor
19  
20   if (ledO >=  28) {          //if it is bright, turn off the light
21    digitalWrite(4, LOW);
22    digitalWrite(3, LOW);
23    digitalWrite(2, LOW);
24   }
25  else if (ledO  >= 20)        //little less bright, turn on blue light
26  {
27    digitalWrite(4,  HIGH);
28    digitalWrite(3, LOW);
29    digitalWrite(3, LOW);
30  }
31     else  if (ledO>= 9)       //turn on green light
32  {
33    digitalWrite(4, LOW);
34    digitalWrite(3, HIGH);
35    digitalWrite(2, LOW);
36  }
37    else                     //turn  on all colurs
38    {
39    digitalWrite(4,HIGH);
40    digitalWrite(3,HIGH);
41    digitalWrite(2, HIGH);
42    }
43    
44  delay(49);
45
46}