So, the CCT isn’t an exact average of 3000K and 10,000K, but an average of the underlying positional numbers? And those don’t scale linearly? That’s interesting. I really DON’T know much about light and/or color!
In all honesty, mixing unknown emitters is a bad questionable idea. Of course can be done, but you'll have to deal with a poorly predictable resulting tint and CRI mishmash. One of the most important factors to consider, if setting emitters in parallel, is you won't exactly know how they will share the driving current. This affects the amount of output from each emitter, and therefore CCT, tint and CRI. It will also affect the relative speed at which each emitter will age, and thus CCT, tint and CRI will also change with use.
When actual emitter tests are available you can at least know what to expect, i.e. you can more or less predict the final outcome.
For example, setting a LH351B 3000K CRI90 in parallel with an (MF) LH351C 5000K CRI90 at ≈1.5A would result in a 0.6A/0.9A current share given their Vf curves (planning to give this a shot sometime).
Nitecore Tube came in yesterday and I put one of these LEDs in, GREAT little light now. On top of the great color/CRI I’m very happy with the output level. these put low and high exactly where I would want them. Easiest 5mm swap I’ve done as well, putting Yujis into a traditional twisty was far more tedious (killed a driver in one).
I decided to make a light module out of 28 LEDs in parallel. Hooked it up to a lab bench. Without constant current regulation, any initial current above 840ma (30ma per LEDs) will result in a (very gradual) thermal runaway where the module start to pull more and more current and heat up more until it would presumably burn out. On the first try, I initially set the current at 1.4A, and it rose up to almost 1.6A within 10 minutes.
Granted, these LEDs are packed fairly tightly together and thus complicating the thermal problem. I'd say, if you want to run this LED on a long term, you shouldn't be running this at 35ma (per LED) or more without airflow.
With 840ma starting current, the final current stabilized at 900ma.