help! can some one explain why this is happening ( induino)

Using Arduino Programming Questions
#1

hi
I am a beginner, really really beginner, so if its a stupid question pleas bear with me.
i am using InduinoX, and I wrote two versions of same sketch but they are not producing the same results.
the sketch was written to make the three on board LEDs blink one by one

void setup()
{
pinMode(11,OUTPUT); 
pinMode(12,OUTPUT);
pinMode(13,OUTPUT);
// Our  Red LED is on pin no 11, Blue LED is on 12 and the White LED is on 13, and we are telling processor to make it an output meaning send some signal.
}
void loop()
{
 digitalWrite(11,HIGH); // Telling the processor to send ON signal to pin 11 (Red LED) , in electronics High is ON and LOW is OFF
  delay(500);               // Wait for half a second
  digitalWrite(11, LOW);    // Turn the LED OFF 
  delay(500);               // Wait for half a second
  digitalWrite(12,HIGH); // Telling the processor to send ON
  delay(500);               // Wait for half a second
  digitalWrite(12, LOW);    // Turn the LED OFF
  delay(500);               // Wait for half a second
  digitalWrite(13,HIGH); // Telling the processor to send ON 
  delay(500);               // Wait for half a second
  digitalWrite(13, LOW);    // Turn the LED OFF
  delay(500);               // Wait for half a second
}

this is working fine and i am getting full intensity on each LED.
another version

int i ;    // verialbe i wich is an integer.

void setup()  { 
  // assinging i as a pin no
  pinMode(i, OUTPUT);
} 

// the loop routine runs over and over again forever:
void loop()
{ 
for (i=10 ; i < 14 ; i=i+ 1)// make the value of "i"( pin no ) increase by 1 starting with 10, 10+ 1 =11(Red )first then  11+1 =12 (Blue ) and then 12+1=13( White)
{
 
 digitalWrite(i,HIGH); // turn ON the LED
            delay (500); //wait for half a second
           digitalWrite(i,LOW);//turn of the LED
           delay (500);//wait for half a second
}
}

here i am getting very less intensity of light on each LED?
I can’t understand why its happening.

Moderator edit:
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tags added.

#2 
int i ;    // verialbe i wich is an integer.

void setup()  { 
  // assinging i as a pin no
  pinMode(i, OUTPUT);  ///////  You forgot to put a loop around this so it probably sets Pin 0 only.
} 

// the loop routine runs over and over again forever:
void loop()
{ 
for (i=10 ; i < 14 ; i=i+ 1)  ///////  This should be (i=11; i<14; i=i+1) to get 11,12,13
//////////  The increment part (i=i+1) happens AFTER the first time through the loop.
{
 
 digitalWrite(i,HIGH); // turn ON the LED
            delay (500); //wait for half a second
           digitalWrite(i,LOW);//turn of the LED
           delay (500);//wait for half a second
}
}

The rest of the code looks OK. I’d recommend not making ‘i’ a global variable. It gets confusing when more than one function can be changing it. The way I would write it is:

void setup()  { 
    // Set pins 11-13 as OUTPUT
    for (int i=11; i<14; i++)
        pinMode(i, OUTPUT);
} 

void loop() {
    // Blink 11-13 in turn
    for (int i=11; i < 14; i=i+ 1)  { 
        digitalWrite(i,HIGH); // turn ON the LED
        delay (500); //wait for half a second
        digitalWrite(i,LOW);//turn of the LED
        delay (500);//wait for half a second
    }
}
#3

Hey Thanks a lot, I have noy yet been able to use your suggestion as i am travelling but i will let you know as soon as i will be able to.

#4