Driving 8 x 117W COB LEDs
Mouser's search for LED drivers lets you specify an input voltage range, output voltage range, output current ability, and constant-current operation.  Here's that search with your parameters entered: CC LED Drivers

This device looks like it might be a perfect fit: MEAN-WELL_NPF-120D-54BE

It accepts 127-431VDC input, and supplies up to 2300mA at 32-54VDC, and is dimmable.  You'd need one per LED, which should be doable as they're only $46 each.