Arduino 2560 I2C control of the DLPC350 projector

Hi, I am trying to control a LightCrafter 4500 with an Arduino. I try the simple task to flip the image and it does not work.

I am connected to I2c1, with no pull-up resistors

Here is my code:

#include <Wire.h>
#define LC4500_I2C_ADDRESS 0x1A

void setup()
{
  Wire.begin();
  Wire.setClock(100000);
  Serial.begin(9600);
  Serial.println("\nLightCrafter First Command");

  Wire.beginTransmission(LC4500_I2C_ADDRESS);
  Wire.write(0x08);
  Wire.write(0x01);
  Wire.endTransmission();
}

void loop()
{
}

Thanks for your help.

Paul