I think what you are talking about is called a radiometer. What causes it to spin is not the change in momentum from light "particles" hitting the paddles. In fact, the black side of the paddles absorbs much of the incoming light, causing the black side to heat up, while the white side stays...
I don't think that light produces any force directly from its motion. The energy from light can cause a force to be generated, however.
What exactly is your project?