Make sure both cobs have ~ the same Vf.
So the current will be devided ~ 50% / 50%.
Take care of an efect that happens if one cob get much more current than the other:
- He will get hoter than the other cob --> Vf will go down with the rising chip temp. - and this cause aditional rising of current.
You avoid this with a good heat management (my cobs are
watercooled) and making shure that one cob alone can stand 100% of the current.
eg. 1. pic - led driver 50W / 1,5A with 50W cob full spec. pink 1800K
2. pic - adding in paralell 50W cob ww. 3500K
- and ( 30W red 630nm in series with 10W 2000K )
3. pic - the combination of 11 cobs with 4 different spec. increase light efficacy ~ 50%
and my babies and me - like the fuller spec. a lot in flowering.
I doubt that a plant give significant response to the difference in cri of the same white cob -
but driving 2 cobs @ 50% current instead of 1 cob @ 100% will rise light output a lot and give you better results.
So yes - it`s possible to mix different cri
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