You keep saying "let it go" then you start it up again your being passive aggressive. But back to the question how did you determine this %5 difference what labs have you had testing done at? Maybe one of the labs you used messed up? 5% is alot people get really excited about 5% output increase.
In the past, when I was still working, we often had to do with "exact measurements" incl. laser aso. but that was in a completely different area and had nothing to do with light.(auto industry, body developement for cars)
One, however, can always be transferred to most of all areas. Tolerances below 0.005% are really hard to reach in real life and I would not vouch for it.
When Steven says, many labs even calibrate more often than prescribed. I say, they maybe have a reason for it... We're not talking about 100% identic aperatures, not even about the same sensor nor the same person behind the maschines. Its may not a 5% difference all the time and between each test equipment but its for sure not within 0,005%. With an 2,5μMol/j strip tested the results arcoss different equipment must be within ±0,01μMol/J for such a degree of accuracy.
I have not enough money to send my 4 boards in 4 different labs to compare the results, (I'm early retired because of an accident) but I still say you probably see a higher difference than you may think.
BTW, with "let it go" I've meant "let it go away, stop, don't think about it anymore..." There is still a language barrier I've to deal with so please keep that in mind. I've not meant, let it go, I'm ready to rumble.
I really don't want to fight with him, not for a single second. I've just another opinion about accuracy and the only thing I've said is, that the difference is maybe a bit smaller because of different test equipment. Have I tried to make this boards looking better? For sure.. at least a little bit. But what means 5% in this area? 0,1μMol/J?
Shit! Is something like that really worth such a long and useless debate?
I've already said, I regret already to have said it.
The thing is, even with the language barrier I recognize it when someone is trying to make me look like an idiot. If needed I can still shoot back! Most people knowing me know I hate to fight and I'm always friendly and never have bad intesions.
See, I'm not a young boy looking to test out his fighter skills. I'm more like an old dirty harry who is sitting on the veranda .. You can annoy him for a while but do not exaggerate it, dirty harries always have a shotgun next to him.
Let us stop this useless fight! He can not convert my opinion and I not his. Basta! Thats no reason to start a war and involve more and more members.