I have a power LED that requires 600mA at around 25 Volts. Since there are mainly 24 Volts and 36 Volts power supplies available on the market for a reasonable price, I needed to choose a 36 Volts model, because otherwise (at 24 Volts) the LED would be undervolted and probably draw a lot less than the nominal 600 mA. So this decision is already made and not part of the question.
But now for the constant current control: I found two models of constant current DC-DC converters, one rated for up to 36 Volts input, and the other for up to 56 Volts (for those interested, they are the Meanwell LDD-600L and LDD-600H, but that doesn't matter for the question).
I wonder if it is safe to choose the 36V input model and drive it with my 36V power supply, or if I should rather choose the 56V model.
In other words, can I generally assume that the manufacturer has already included a safety margin into the 36V input voltage rating, so that it can operate at this voltage for an indefinite amount of time. Or would prolonged operation so close to the upper boundary of the spec result in severely reduced life span?
At least as far as I can see, the datasheets seem to give no indication about that.
By the way: buying an already current limited power supply is not an option because I would need three of them (it is actually an RGB LED) because of cost and because I want PWM control.