I purchased two identical power supplies rated DC 28-38V at 3A. But, when I measure the voltage, they both show 52 volts. Is this correct? Because of the 52 volts

I added a step down converter to hit 30 volts but I am worried, because my converter is not rated for that high. Only 38V I believe.

Also, when I measure the amps on a 30-32V 1.7 amp 50 watt LED, I get 1.4 amps.

I purchased another power supply labeled +24V. It goes up to 28V. When I test the same LED, I get .46 amps.

Lastly , I have a 30V 1A power supply. When I test the same LED, I get .75 amps.

Am I misunderstanding something, or are all these power supplies faulty/ or not honest about their ratings?

I added a step down converter to hit 30 volts but I am worried, because my converter is not rated for that high. Only 38V I believe.

Also, when I measure the amps on a 30-32V 1.7 amp 50 watt LED, I get 1.4 amps.

I purchased another power supply labeled +24V. It goes up to 28V. When I test the same LED, I get .46 amps.

Lastly , I have a 30V 1A power supply. When I test the same LED, I get .75 amps.

Am I misunderstanding something, or are all these power supplies faulty/ or not honest about their ratings?

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