The 3A limit is also a possible issue if it truly can’t handle anymore then that. That could be a real issue with using FET drivers which would make it even harder to use these.
I quoted 3.0-3.5 A from the manufacturer’s spec sheet. I have no idea how much it can take more than that due to the lack of testing equipment. I sent the samples to djozz for this purpose.
In comparison, the 12v version XHP70.2’s are rated at 2.4A as the absolute maximum, yet I saw people overdrive the hell out of it.
These FC-40 can probably survive well above 3.5A (at least for a short period), but I probably don’t want to take responsibility for that claim.
Anyway, djozz has gotten samples, and I hope he publishes the result soon. Keep an eye on the discussion thread.
Clemence had problems placing four E21a’s too close together, some of the photons would go out the side of the emitter and heat up the one beside it. It lead to the whole array overheating and dying.
This led has the advantage of phosphor between the dies but the four in the middle may have a hard time trying to stay cool.