hi
i'm working on my graduation project and i have to use this color & light sensor
there is just one thing that i didn't understand ; why it has 2 SDA and 2 SCL ?
and how can i wire more than one sensor with arduino (im working with eagle) because thre is nothing
in it's datasheet 
there is just one thing that i didn't understand ; why it has 2 SDA and 2 SCL ?
One of them is prepared for a 5V microcontroller while the other is for a 3V3 cpu (just the pullups and a MOSFET as a level converter).
and how can i wire more than one sensor with arduino (im working with eagle) because thre is nothing
in it's datasheet
it's not that easy to connect more than one of these sensors to the same Arduino because they have a fixed I2C address. An efficient and quite straightforward way is to use an I2C switch chip as the TCA9548A. With such a chip you can connect up to 8 of the TCS34725 chips to one Arduino.