I have Meanwell LDD-700LS. They are surface mount and look like a pain to solder. Oh well, I have them so I'll get it done.
I did not find any mention of hooking up the dimming function of several LDD700 units in parallel to Arduiono in the linked thread. I did look at the datasheets-sorry to say I did not understand enough to find the answer.
I soldered the LED strings in series with no resistors. Yes, all four strings need to be treated as a single light. I am interested in Arduino for the control that is possible.
I just thought maybe someone would know off the top of their head if connecting 4 LDD700s in parallel to Arduino for dimming is OK.
BTW, this is for a dual algae filter. There are really 8 strings of LEDs and 8 LDD700s, 4 strings at the blue peak for photosynthesis and four strings at the red peak. I could definitely make it work without the use of a microcontroller like Arduino, but I'd never be able to find what I'm looking for in the filter without one.