@MAXHeadRoom I wanted to try and explain better earlier, but I had something come up mid response.
The quantam boards are using series/parallel layouts. I’m not exactly sure what the string counts are, but I’m sure we could find them. What I meant was that we kinda have to work with what they give us. The engineer that lays them out probably tries to get us close, and then leave it up to us from there.
I’ll try to make a simple example using ten 3 volt diodes with max current of 1000ma…
All ten diodes wired in series would have fv of 30 Volts with max current of 1000ma. They would have max output and least lumens per watt at 1000ma. If we run at 700ma, power goes down but lumens per watt goes up. And so on.
Taking the same 10 diodes and wiring them in parallel would be fv of 3 volts and max current of 10 amps. Running at 10 amps in parallel each diode receives the same 1000ma, will have the same output and efficacy as wired in series. It will just have a different driver application.
Now if we took the 10 diodes and wired two strings in series of 5, each string would have fv of 15 volts and max current of 1000ma. Then we took both of those strings and made a parallel connection, it would give us the same 10 diodes at fv of 15 volts with a max current of 2000ma.
In the 3rd example, if we powered with a cc driver ar 2000ma that had say a 12-18 vdc range, it would be the same exact efficiency as the first 2 examples. If we dropped the current, our led efficiency will go up just like in the other examples as well.
So it’s not really that one board is more efficient than the other. The diodes are the diodes. But hlg designed the 288 board with more parallel strings and the 304 with larger series strings. Obviously there is one less row, but that’s not exactly the electrical difference in the boards.
Hopefully that makes more sense, and sorry for the short answer earlier.