OPT101 SENSOR AND LEDs INACCURATE READING

HI, I got a problem with my circuit. I used 5 near infrared LEDs as the light source and opt101 as the detector. the LEDs should turn on one by one and I manage to get it. the problem that occurs is the sensor show an inaccurate reading, which is a maximum reading of opt101 but when I use only one LED I manage to get the accurate reading of the sensor.
Below is my coding.

int a;
int voltage_A2 = A2;
int actualvoltage;
int voltage;
void setup() 

         {

         pinMode(8, OUTPUT);          //LED 1
         pinMode (9, OUTPUT);         //LED 2
         pinMode (10, OUTPUT);         //LED 3
         pinMode (11, OUTPUT);         //LED 4
         pinMode (12, OUTPUT);         //LED 5
         pinMode (A2, INPUT);           //DETECTOR

Serial.begin(9600); // opens serial port, sets data rate to 9600 bps

      while (! Serial); // Wait untilSerial is ready
      Serial.println("Enter A To Start Take Reading");
      Serial.print (" 1 = 780nm");
      Serial.println();
      Serial.print (" 2 = 850nm");
      Serial.println();
      Serial.print (" 3 = 870nm");
      Serial.println();
      Serial.print (" 4 = 910nm");
      Serial.println();
      Serial.print (" 5 = 940nm");
      Serial.println();}

void loop() 
{
 if (Serial.available())
{
  char ch = Serial.read();
  if (ch == 'A')
   for (a=0; a<5; a++)
        {
       //_____________________________________________________________________
       //                           LED 1
       //_____________________________________________________________________
          digitalWrite(8, HIGH);   // turn the LED on (HIGH is the voltage level)
          delay(1000);              // wait for a second
          voltage = analogRead (A2);
          Serial.print("LED1 ::   ");
          Serial.print (voltage);
          Serial.print ("\t");
          digitalWrite(8, LOW);    // turn the LED off by making the voltage LOW
   
      //_____________________________________________________________________
      //                           LED 2 
      //_____________________________________________________________________
          analogWrite (9, 255); //turn the LED on (voltage is High)
          delay(1000);  // wait for a second
          voltage = analogRead (A2);  
          Serial.print("LED2 ::  ");
          Serial.print (voltage);
          Serial.print ("\t");
          analogWrite(9, 0);    // turn the LED off by making the voltage LOW
  
      //_____________________________________________________________________
      //                           LED 3 
      //____________________________________________________________________

          analogWrite (10, 255); // TURN THE LED ON (VOLTAGE IS HIGH)
          delay(1000);   // wait for a second
          voltage = analogRead (A2);
          Serial.print("LED3 ::  ");
          Serial.print (voltage);
          Serial.print ("\t");
          analogWrite(10, 0);    // turn the LED off by making the voltage LOW
    
        //_____________________________________________________________________
        //                           LED 4
        //_____________________________________________________________________
  
          analogWrite (11, 255); // TURN THE LED ON (VOLTAGE IS HIGH)
          delay(1000);   // wait for a second
          voltage = analogRead (A2);
          Serial.print("LED4 ::  ");
          Serial.print (voltage);
          Serial.print ("\t");
          analogWrite(11, 0);    // turn the LED off by making the voltage LOW
     
        //_____________________________________________________________________
        //                           LED 5
        //_____________________________________________________________________

          digitalWrite (12, HIGH); // TURN THE LED ON (VOLTAGE IS HIGH)
          delay(1000);   // wait for a second
          voltage = analogRead (A2);
          Serial.print("LED5 ::  ");
          Serial.print (voltage);
          Serial.print ("\t");
          digitalWrite(12, LOW);    // turn the LED off by making the voltage LOW
          Serial.println();
       //   return;
        //} 
        }
        }
      
    else {
       
       }
}

Hello,

You might want to remap the analogue output values.

The analogue read is from 0 to 1023.
The spectral response for an TI OPT101 is 400 nm to 1100nm.

Below is an example on how to remap the sensor values.
float spectralReponse = map(sensorValue,0,1023,400,1100);

Best,