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I understood you well. Just because something runs warmer not nessary means is out of spec.

These drivers are design to put out 48v at 1.25ma. By lowering the current to 1 amp, your running below...

LEDs are current devices.

At 48 v with 13 LEDS, your at 3.69 v per LED.

Running at 10v as the dimming voltages, your running at 1.25a.
The specs for the LED are 3.6v at 1000ma.

LEDs are...

These drivers run at 3.3ma at 10v.
3 of them should be the limit per channel.