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May 18, 2022
A lot of clients come across wondering why the 1-10V dimmer they have bought can't dim the light down to OFF. The answer that they usually get is that because the dimmer they are using is 1-10V dimmer which can dim the light down to only 10%. Alternatively, they are advised to get a 0-10V dimmer to be able to dim their lights down to OFF.
Unfortunately, the previous answer is inaccurate.
In fact, the dimmer whether it's 1-10V or 0-10V dimmer is not the circuit element that defines to which level the light can be dimmed down. The dimmer only sends a dimming signal to the driver, which is different from the driving current that drives the LED chips in the luminaire. The driver in its turn maps the dimming signal from the dimmer to the dimming range that it's capable of operating within. In other words, the driver is the circuit element that defines to which level the light can be dimmed down.
A very common misconception is that the difference between 1-10V dimmer and 0-10V dimmer is that the first can dim the load down to 10% while the latter can dim the load down to 0% (dim to OFF). This is incorrect!
The main difference between 1-10V and 0-10V dimmers is the current direction, not the dimming level. Both of 1-10V dimmer and 0-10V dimmer are capable of dimming the load down to 0%.
As I mentioned above, the led driver is the circuit element that's responsible for defining the dimming level of the load. Every dimmable Power Supplies has a dimming curve which describes the dimming journey from the minimum allowed dimming value up to 100% output. Most of the drivers Power Supply have a linear dimming curve which means the load lumen output corresponds linearly to the dimming signal from the dimmer. One of the power supply's important specifications is the minimum dimming value. Most of the drivers in the market have a minimum dimming value of 10% of the max output, which corresponds to 1V in case of 1-10V dimmer and corresponds to 0V in case of a 0-10V dimmer. This means 10% is the minimum output that the driver can deliver to the load regardless of what type of dimmer controlling the driver. In order to dim the load down to OFF, the driver needs to be able to deliver as low as 0.1% of the max output.
In Conclusion, if you need to dim your load down to OFF, you need to check the LED Driver connected to the load, not the dimmer connected to the driver. If the power supply is able to deliver as low as 0.1% of the max output, this means the load can be dimmed down to OFF regardless of the dimmer type connected to it.
From Linkedin Mina Benyamin
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