It's interesting - I've said this to both Lazeerer and DTR before - but I don't really believe the H-series has different diodes than the M. I'm even going as far as to say that I believe if you bought an A-series that was manufactured TODAY (they're still making them), we'd get these same diodes in them.
I say this, because I just frankly don't think KasEO or Nichia would be binning millions of diodes. I know they could automate this step, but it wouldn't be the most reasonable approach to achieve what they want to achieve. Remember, as far as we're concerned, the projectors are actually under-driving these diodes. All they need to do to standardize lumen output, is fill an array up with diodes, install it in the machine, measure the "out-the-front" lumens, and adjust the overall array current +/- like 10% (maybe even less of a range) to make sure they get the expected lumens. Even the 3000 lumen projectors (vs the 2500) just push current a bit higher. And for that matter, the 3500 lumen (like my H series) or the 4000 lumen (like the H series a model up from mine) are just adding an additional 8 or 16 diodes (for 32 or 40 in total).
So logic is against the notion that these diodes are any different. It makes a lot more sense to me that KasEO buys huge batches from Nichia, and at some stage (around the time they incremented models and came out with the Ms), their previous batch was exhausted, and they transitioned to a new batch from Nichia. Since we know that Nichia has improved their diode, this new batch was the new diode, and the previous batch wasn't.
HOWEVER, this H series projector has been a better diode source than the M240. For one, there hasn't been a single "dud" (low efficiency diode) in the almost 20 I've tested so far. They have also been showing a higher average wavelength.
One way, would be to ask someone to dissect a dead M-series diode and look for the protective diode that is supposed to be somewhere inside the casing. I'm not sure what this would look like, but I do believe that it was a new addition in the NDB7875. If we found it, this would be proof positive. If we didn't, it *wouldn't* be proof negative however, because we know that the batch KasEO gets from Nichia departs from the datasheet when it comes to package size. So if the diode is there, that's a good indication that we've got the new diodes. If it isn't, that won't really tell us anything.
