What means voltage range in this LED driver?
LEDs work best if you drive them with a current.

When you would apply a voltage to a LED or a string of LEDs in series, the current can vary a lot over production lots and temperature. It is very well possible that too much current will flow through the LEDs which makes them hot and limit their lifetime.

So it is better to drive LEDs with a current.

Such a LED driver module does just that. It adapts the voltage such that the specified 300mA current flows. It can adjust the voltage between 60 and 90 V DC in order to achieve that.

So as long as you would use LEDs in a configuration (series/parallel) that  they should be powered at between 60 and 90 V at 300 mA, (20 - 30 W) then this module is suitable.