It shouldn't be difficult to get boards designed with multiple channels. I just had them made with all LM561 diodes, thinking that if I want other spectra I can easily add those on another board, maybe strips. But the design of HLGs 288 boards looks relatively simple - they just divide the board traces into two separate circuits.
But for myself, I'll just run far reds and such on a separate board.
I noticed that HLG is rating its 120 diode board for 65 watts without sinks?
That seems really high. I'm sure I won't need sinks for my 128 diode veg boards running at under 25 watts. My board is 20% smaller, but even 50 watts would make me nervous. I should have them within another week or so, so I'll see how much they heat up. Not needing sinks reduces the cost quite a bit. Sinks cost almost as much as another board.
I sent you a PM, Arctic.