[Solved]If and high-low code problem

i'm measuring sunlight , lcd screen supposed on when bright , off when dark.with code have no problem measuring light.lcd on when bright when darken ldr, lcd not turn off, stays on.am missing here?

code: [select]

double light (int rawadc0)
{
  double vout=rawadc0*0.0048828125;
  double lux=(2500/vout-500)/10;
  return lux;
}


void setup()
{
  pinmode(a3, output);
  serial.begin(9600);
}

void loop() {
  serial.println(int(light(analogread(0))));
  delay(1000);
  if ( analogread(0) > 15)
  {
     digitalwrite(a3, high);
  }
  else
  {
    digitalwrite(a3, low);
  }
}


put value analogread(0); in variable , use instead of reading twice.  try printing value.  see ? 

15 seems low value @ switch lcd on/off don't know setup.

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