Controlling LEDs with 4 ultra sonic sensors

Using Arduino Sensors
2 
// When sensor's 70, 71, 72 & 73 take a reading between 0-50 turn on LED strip on port 5.

if (srf02[0].read() >=0 && srf02[0].read() <= 50)
     digitalWrite(5, HIGH);
if (srf02[1].read() >=0 && srf02[1].read() <= 50)
     digitalWrite(5, HIGH);
if (srf02[2].read() >=0 && srf02[2].read() <= 50)
     digitalWrite(5, HIGH);
if (srf02[3].read() >=0 && srf02[3].read() <= 50)
     digitalWrite(5, HIGH);

// When sensor's 70, 71, 72 & 73 take a reading between 50-100, keep on LED strip 5 and also turn on the LED strip on port 6.'

if (srf02[0].read() >=50 && srf02[0].read() <= 100) {
     digitalWrite(5, HIGH);
     digitalWrite(6, HIGH);
}
if (srf02[1].read() >=50 && srf02[1].read() <= 100) {
     digitalWrite(5, HIGH);
     digitalWrite(6, HIGH);
}
if (srf02[2].read() >=50 && srf02[2].read() <= 100) {
     digitalWrite(5, HIGH);
     digitalWrite(6, HIGH);
}
if (srf02[3].read() >=50 && srf02[3].read() <= 100) {
     digitalWrite(5, HIGH);
     digitalWrite(6, HIGH);
}


// I would be happy to have this communication going first but ultimately I actually want 
// the readings to fade in and out my LEDs, see below:

// 'When sensors 70, 71, 72 & 73 take readings 0-50 fade in LED strip on port 5, 0 being the lowest, 50 being the brightest.

if (srf02[0].read() >=0 && srf02[0].read() <= 50)
     analogWrite(5, map(srf02[0].read(), 0, 50, 0, 255));
if (srf02[1].read() >=0 && srf02[1].read() <= 50)
     analogWrite(5, map(srf02[1].read(), 0, 50, 0, 255));
if (srf02[2].read() >=0 && srf02[2].read() <= 50)
     analogWrite(5, map(srf02[2].read(), 0, 50, 0, 255));
if (srf02[3].read() >=0 && srf02[3].read() <= 50)
     analogWrite(5, map(srf02[3].read(), 0, 50, 0, 255));


// When sensors 70, 71, 72 & 73 take readings 50-100, keep strip 5 on its brightest and fade in strip on port 6, 50 beng the lowest, 100 being the brightest.'


if (srf02[0].read() >=50 && srf02[0].read() <= 100) {
     digitalWrite(5, HIGH);
     analogWrite(6, map(srf02[0].read(), 50, 100, 0, 255));
}
if (srf02[1].read() >=50 && srf02[1].read() <= 100) {
     digitalWrite(5, HIGH);
     analogWrite(6, map(srf02[1].read(), 50, 100, 0, 255));
}
if (srf02[2].read() >=50 && srf02[2].read() <= 100) {
     digitalWrite(5, HIGH);
     analogWrite(6, map(srf02[2].read(), 50, 100, 0, 255));
}
if (srf02[3].read() >=50 && srf02[3].read() <= 100) {
     digitalWrite(5, HIGH);
     analogWrite(6, map(srf02[3].read(), 50, 100, 0, 255));
}