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Welcome back DTR!

Definitely a buck 2 batteries in series. I've been looking for options from single 21700 boost but max i could get is around 7A @ 5V

Voltage should be near 4.8-5V

All the information so far confirms is a single emitter diode. The huge difference here this diode has 1.0mm power pins compared to 0.4-0.6mm on normal 9.0mm diodes, allowing more current to flow. The forward voltage (3.9v) of this diode is one of the lowest seen for its wavelength (465nm) so...

Not much better is just a higher bin

Really wonder what the nubm0f can do pulsed 100W?😁

Im sure they have some prototypes and engineering samples done but those are very hard to find out in wild before product launch.

All 44-61, 44-71, 44-81, 47-81, 47-A1 have flat lens can while the other 4X series have old style gball lens. All of the 0X series has Gball lens but there is 3 different ones across this series. The can on a NUBM07 is different than a NUBM0A, and the NUBM0F is also different.

Looks like a 44-81

Here can see NUBM44-71 vs NUBM47-A1 courtesy of @loreadarkshade can't spoil any more pictures up to him if he wants to post the rest🤐

44s is more abundant currently but depends over the years one can be more than the other. Only few that have had many of them in hand can tell the difference. But you'll want a microscope to tell for sure.

When you test so many diodes running them at full rated power means you'd need to heatsink them and wait for temperatures to stabilize while a threshold just bypass most of that 😁. But yeah id get a selected few 4 off a block and test those further after i know they are the better of the bank.

Then you're doing it right. 😁 Tells me that this diode can potentially hit a higher output than the rest. Essentially more efficient in the batch.

Not hard with right tools I can sell the whole block or i can extract the diodes for buyer same price.

So many things can affect a LPM reading. And extracting diodes from a block/bank is a process that can break the diodes easily. Not many people have the patience and tools to extract diodes properly without overheating them or dropping them to hard. I test my diodes at minimum threshold 500mA...

Used so it was cheap.

Well the 44s and 47s to have a higher lumen per diode. But you are 100% right x2 blocks of x8 diodes can do 6,000 lumen. But they use x4 to drive them at a more conservative power level for longevity. Even the Sony ones i have here do the same x4 blocks of x8 diodes to get 6,000 lumen with...

Funny enough there was never a "V1" or "V2" just different sources. Only NUBM44-61, NUBM44-71, NUBM44-81 For the NUBM47-A1 The "A1" represents "A" in hex base-36 is "10" (x10 diodes) and "1" (x1 module) But to answer your question the typical wavelength of the 44s is more towards 440-445nm...

Push push 3A? Idk with that price tag I would stay there too lovely typical color🤤

I have a NUBM47-A1 (very low hours) block x10 diodes all capable of 7W+ 445-455nm range. Special price for whole block or just diodes your choice. 250$ + shipping