Constant Current Output driver connected to 2 COB LEDs - is the hookup valid?
Two LED strings (no series resistors) in parallel rated at 180 mA max each cannot be expected to share the current from a 300 mA constant source equally. One may hog the current and be stressed. Even if they did share equally, 150 mA is far more than the nominal LED rating of 90 mA. This is a bad design. 

A good design would use a 90 mA constant current source and put the LED strings in series. Or use a constant voltage with series resistors.