I took a look at the 0.9.1 implementation. It accepts an integer instead of color objects and it allows you to chose between red, blue, green, none, and white.
I don't personally own this sensor, and I believe that settings the floodlight color might not mean what you expect. AFAIK, the sensor doesn't have a white LED. Instead, setting the floodlight to white might mean, that when the sensor is measuring, the LED will be switched between the three colors red blue green really quick. I'm not sure, whether settings the flood light to one of the elementary colors will immediately change the color of the LED. You might have to call read() once.