wow that looks so professional. How difficult is it to wire the knobs to the ammeters? Does this require calibration or is it when the know is all the way to the right it's at 100% and when it's all the way to the left it's 0%?
The dimmer circuit in the Meanwell drivers works by giving a current that is proportional to the voltage across two wires out of the driver. The voltage across those wires has to be 10 volts maximum. So, you use a 10 volt DC converter, with that connected across the outer terminals on a 10,000 ohm potentiometer. Then the wires from the driver go to the 0 volt end of the potentiometer and to the middle terminal on the potentiometer, so turning the shaft clockwise increases the resistance (voltage) between those two terminals. It sounds a lot harder than it is.
Then the digital ammeter also has 10 volts DC on the backlight circuit, from the same 10 VDC converter, and the two current measuring wires from the ammeter connect in the circuit to the LEDs, so all of the LED current flows through the potentiometer. That way the ammeter readiing is the LED current.
I will set the light up, and measure the PAR I get at 3-4 different currents, plot those data points to get a calibration curve for the light, showing PAR vs current. I have two colors of LEDs, neutral white and cool white, so I will have a calibration curve for each color. And, each chart will have the PAR vs current curve for probably 4 different heights of the light from the PAR meter sensor. Since the PARs add together, you can set the color of the light to suit you, then adjust the two currents to maintain that color, but at the PAR that you want at the substrate.
There are 3 blue LEDs, which have a separate power cord, so they can be on a different timer, for moonlight, and/or to add some more blue to the daytime light. Those will probably add a tiny bit of PAR, so can be ignored when figuring how much PAR you have.
This is the first time I have attempted to make a PAR calibrated light, so who knows how well it will actually work out.