driving led current and voltage
If the driver is 300mA and a maximum voltage of 130V then the maximum power
is 39W. It sounds like the lamp description is poorly written. The LEDs are capable of 138W but the light fixture is not.

It is not unusual to under drive LEDs. It improves the lumen maintenance and
lamp life. In light fixtures a 3W (max) LED would typically be driven
at 1 - 2W. 300mA is low but not unreasonable. 

I would not change the driver or increase the current. The light is probably
qualified at 1W per LED not 3W. You could have thermal and safety issues.