I believe that problem was associated with their 1000 model, making the supply remote (most Mars hydro lights now allow this) cured the problem. Looks like a grounding thing. Mine (SP3000) shut down fine, power supply in place.Do you know what model that is? Looks sweet.
Is that the one where you need the driver mounted away from the light? I heard guys were having trouble with the leds powering down because they were in close proximity to the power cord. Not sure which Mars were doing this.
The issue would not be hard to fix, appears the supply needs isolated from frame of light.That was the issue I was talking about the drivers needed to be moved off frame,
I am not sure of the one you just bought seems they worked the ground problem out
We Hope. Nice Light Brother