Programming a photocell with if/else and analogWrite

i'm pretty newb @ working arduino (and electronics/circuitry matter) , can't seem figure out how close if/else conditional. i'm trying use photocell light-reactive night light, led turns on when photocell isn't receiving enough light. when first upload code, adequate light, works; led won't turn on. when turn off lamp, light comes on, supposed to. however, once turn lamp on, led doesn't go off. i'm using tri-color led analogwrite rules. can't quite figure out how close make led turn off successfully. in advance help!

code: [select]

void setup()  {
serial.begin(9600);
}

void loop()  {

int sensorvalue = analogread(a0);
if (sensorvalue < 200) {
  for(int b = 0 ; b <= 255; b=b+5)
  {
      for(int g = 0 ; g <= 255; g=g+5)
    {
      for(int r= 0 ; r <= 255; r=r+5)
       {
        analogwrite(9, b);         
        analogwrite(10, g);         
        analogwrite(11, r);   
        delay(10);
       }

      }
    }
  }
  else {
    analogwrite(9, low);
    analogwrite(10, low);
    analogwrite(11, low);
  }

}

this code takes 1,250,000 ms run...

code: [select]

  for(int b = 0 ; b <= 255; b=b+5)
  {
      for(int g = 0 ; g <= 255; g=g+5)
    {
      for(int r= 0 ; r <= 255; r=r+5)
       {
        analogwrite(9, b);         
        analogwrite(10, g);         
        analogwrite(11, r);   
        delay(10);
       }

      }
    }


if wait 20 minutes led turn off.

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