In the UK we can buy the pucks to do the upgrades ourselves so access to the old pucks isn't too bad. Sadly everyone is upgrading Gen1 to Gen3 right now so they are the only pucks readily available so my information is only available for Gen1.
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Also I have just tried a Gen1 main board to power it up connected to Gen1 pucks. No luck it doesn't work. At the moment I'm guessing it's due to the missing buttons, LED, or fan but not sure which. I don't know what the connectors on the back of the main board are for sadly.
By ballast do you mean power supply?
If so I used an Ecotech power supply as I managed to find one on ebay a couple of months back.
Yes, thats what I meant. It would be nice to figure out how to use their board with a DIY driver.
Is it 24V or 48V supply to the mainboard?
If you mean the LED boards then it's no problem, I've run them with LDD's connected to the PUCK. I used a meanwell 48v PSU into LDD's and then connected directly to the JST-PH connector on the pucks. I posted the pinout for the Gen1 pucks earlier.
The ecotech PSU is 36v to the main board, it says on the screen printing you can input up to 42v though.
Has anyone figured out the forward voltage per channel for an individual puck (Gen2). I was going to figure it out real quick so I knew how many drivers, LDD boards and what size P/S to get but just wanted to see if anyone had it figured out yet.