The supplied voltage to the driver must be at least 2-2.5V higher than the total maximum voltage drop of your string of LEDs that is being run by that driver. Look up the spec sheets for your LEDs and they'll typically have a voltage versus current plot. Figure out the voltage drop at 1000 mA for each LED and then add them all up. Since you can supply up to 52 VDC to the LDD-1000H, you can get quite a few on there (basically a LDD-1000H can handle up to ~50W of LEDs). Make sure your LEDs can handle 1000 mA - some pop after 700 mA.
The closer you get your supply voltage to the voltage drop of the string, the more efficient the driver will run. If your string voltage drop is 24V, run your power supply at 26V instead of 30V (the drivers will run hotter because they have to sink more excess voltage). Most power supplies can be adjust +/- a few volts to help with this.
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