light sensor bh1750 - need help to understand the datasheet

hello,

i want to try it here, in the english forum, becouse i dont can find much informations about this sensor.
my english is not so good, but i will try it.

i want to use the bh1720 with 0,11lx and 100000lx (on an attiny).

with this libary it works:
Umgebungslichtsensor BH1750 - is in german !
GitHub - hexenmeister/AS_BH1750: a (Arduino) library for the BH1750FVI Digital Light Sensor

but the libary dont work good on an attiny with tinywireM.

and i like to use it without the libary.

but i dont understand the datasheet…

http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1750fvi-e.pdf

what have i to do for 0,11lx and 100000lx ?

i have this:

#include "TinyWireM.h"

#include <SoftwareSerial.h>

SoftwareSerial softSerial(88, 3 ); //rx= physikalisch Pin 3(attiny85) Pin 11?(attiny84), tx= physikalisch Pin 2(attiny85) Pin 10(attiny84)

byte buff[2];
int Adresse = 0x23;
float Lux = 0.00;


void setup()
{
  TinyWireM.begin();
  softSerial.begin(9600);
}


void loop()
{
   
 
  // Check I2C Adresse
  TinyWireM.beginTransmission(Adresse);
  if(TinyWireM.endTransmission()!=0)
  {
  softSerial.println("falsche i2c adresse");
  }
 
 
  TinyWireM.beginTransmission(Adresse);
  TinyWireM.send(0x21); // 0,5 lux aufloesung + Power down
  TinyWireM.endTransmission();
 
 
  byte i=0;

  TinyWireM.requestFrom(Adresse, 2);
 
  while(TinyWireM.available())
  {
    buff[i] = TinyWireM.receive();
    i++;
  }

    Lux = ((buff[0]<<8)|buff[1])/1.2;
   
    if(Lux < 0)
    {
    softSerial.println("> 65535");
    }
    else
    {
    softSerial.print(Lux); softSerial.println(" lx");
    }
 
 
  delay(1000);
}

but its only to 65535lx

thank you very much

See the RED text http://playground.arduino.cc/Code/USIi2c