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Many types of LED drivers has output Voltage range and not exactly regulated voltage, i asked the seller and he say that means it suitable for all power LEDs that works with voltage range between 60 to 90 V, but i am wondering how can this LED driver understand how much voltage your LED need? Already i test the open circuit voltage and it was even more than 100 V.

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    \$\begingroup\$ 60-90 V is the compliance voltage range. Google it. \$\endgroup\$ – winny Mar 28 '17 at 8:40
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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.

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