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I am trying to test a LED lamp of 24V and 40W with the driver HLG-40H-24B (constant current, output 24V and 40W) but it does not work correctly: The LEDs flash regardless of the voltage value (from 1V to 10V) that is applied in the DIMMING input of the driver.

In RS-Online, I found this document (A guide to buying LED drivers) where it explains that for a LED driver of constant current, it is necessary to choose one with a higher output voltage than the LED lamp (page 4). Is this why the LEDs are blinking? If so, what output voltage and output power should the constant current LED driver have to drive this 24V and 40W LED lamp? Thanks in advance.

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  • \$\begingroup\$ You need a constant current driver that is capable of supplying a higher voltage than what the minimum required by the LED lamp is. \$\endgroup\$ – Andy aka Feb 14 '18 at 16:28
  • \$\begingroup\$ Thanks! Do you think this led driver could work? link \$\endgroup\$ – FranMartin Feb 15 '18 at 8:51
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This driver should work fine.

With the dim wires left open it will supply 1.67A and up to a forward voltage of between 14.4v and 24V.

I suspect your problem is the 0-10V supply circuit.
I do not know what that looks like so I cannot help there.

When I use an HLG with the 0-10v dimming I use a variable bench supply and it always works perfect.

You can easily test by using various batteries for the 0-10v input.

Post your 0-10v dimmer circuit.

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