GATE of each FET in orientation of photo (gate is the top leg of each FET) with color set to white (each FET getting constant voltage) and brightness set to maximum.

Top FET: 4.73v
Middle FET: 4.0v
Bottom FET: 2.75v

The Source leg measures exactly the same for each FET. And ON/OFF (with the remote) of the controller doesn't make a difference.