How to measure green/blue reflected light on EV3? As I know there is no way to turn on green/blue reflected light on EV3 color sensor.

Is there a way to do it using NXT color sensor and EV3 controller?

Or the only way is to use NXT controller together with NXT color sensor?
There is a modified Color sensor block available here.

As of this writing, this is the most up-to-date direct link to download the block.