Yeah I’d guess the “spectrum” measurement is integrated over longer time, while flicker is obviusly recorded with super short integration time, since you need fast sensor polling. My guess is, sensor in fast mode is too noisy for spectrum.
But it would still be nice if a single button press automatically recorded first one, then the other, then saves all results.
So the current OPPLE Light Master 4 Lux Meter can be used reliably with only OPPLE lights, does not even read daylight correctly.
How can a company release device make manufacture it, and then it turns out they forgot the software side? Meaning programmers know nothing how to measure light are writing software for OPPLE Light Master 4 Lux Meter?
Sounds like a student project to me not like a proper product.
The price tag 96.34Eur is really showing how fake the product is.
The LM3 was very impressive considering the sensor it worked with and its cost. So everyone assume LM4 was just going to be better, because the sensor was better.
I still have hope that LM4 results can be better than LM3 with software fixes.
Tbf that is pretty much common practice on aliexpress. Almost every shop has ridiculous “base” prices and continous sales.
With all LEDs I own, it shows more or less what I expect - both CRI and R9 match LED spec sheets (SST40 5700K, XHP70.3 HI 5700K R9050, 519A 5700K dedomed, some random Xiaomi desk lamp with high CRI variable CCT, as well as XML-U2 5700K). While it has its issues, it still measures decently for most LED types and only bugs out occasionally. Something that the LM3 does, too, btw. A friend of mine bought and compared both, got some weird and some right readings out of either.
It looks to me like management at Opple does not care about the product at all, but at least steve here appears to be motivated and actually want to make it a good product. I hope his managers will support him in that, and not tell him to stop eventually as they deem it “good enough”.
Look at that discount percentage though
Version 4 still not sold in EU. Instead they sell only
Opple Light-master-III (599000032700) or Light Master G3
I think they know that quality problems with v4 would instantly kill the product overnight.
Please find me v4 on OPPLE EU website
An this is after a year of promises on this forum from OPPLE rep that is not a rep at all, that new updates are going to fix the product.
To sell something outdated, you need to release something even worse.
Anyone know better flicker tester then OPPLE V3? Osciloscope DIY has matured to some product if it’s so great?
Russian volunteered to save the OPPLE V4, but so far BLE protocol not released?
" Эх, слил бы протокол обмена, мы бы сами альтернативное приложение написали, ещё и лучше официального. А реинжинирить - мартышкин труд 
Хотя там может уже и на уровне прошивки через жопу, тогда и протокол обмена не спасёт…"
По-моему, в этой части меньше всего вопросов.
obviously I am not rep from OPPLE, nobody would authorize me to be rep of OPPLE. nobody pays me to be rep of OPPLE. It’s purely my own interest in interacting with you guys, maybe just for improving my English proficiency, because perhaps someday I would go abroad. if you guys want me to stop this forum, I’d quit.
I feel furious too, not only you guys. I devote myself wholeheartedly to this project, and it brings me nothing good. it really sucks. as you mentioned I am not familiar with light, why force me to know/do spectrum related things, I am just a plain programmer and happens to know something about AI algorithm aspect thing.
btw, due to the limitation of the resolution of the spectral sensor, you have a high expectation for LM4 to be as accurate as CL-500A is not realistic, think about the price tag. a few tenth of CL-500A’s price, what would you expect? LM4 has to support this company’s own spectra which spans across a range from 1800K to 12000K, this obviously is out of range of an average user’s LED measurement requirement and would somewhat distort the original accuracy(originally only slight around the range of 2700K to 5700K).
sorry, I am kind of emotional, it really really really sucks.
You’re fine Steve, some people just take flashlights too seriously. The normal folks are glad to have you around.
Initiative is always punishable))) That’s a joke.
This policy of OPPLE is incomprehensible. But, perhaps, it is you who will be able to convey to them the opinion of some of the customers.
Do not take all the negativity personally. It’s bad for you)))
I’m mad at OPPLE (for their current view at v4) not at the @steve (do not take it personal) I think it’s great that somebody still wants to help the product be better.
I think first OPPLE’s own spectra does have priority compared to other spectra, so we first need to optimize for our own lights. second, flashlight’s light is more concentrated, and it does exhibit some difference with ceiling light which disperse across the whole room. I consulted somebody, he told me the plastic glasses(lens) matters.
nowadays, people around me think LM4’s accuracy is OK now in measuring lights that this company manufactured.
for LM3, the coefficients are as above, “系数” means coefficient in the first row/column, for LM4 we changed chip, so those number must be recalculated, seems the “K_CRI” is normalized by first column number(1.0000), I really have no idea of how those magic numbers are, I think only the original author knows how he got those magic numbers.
I’ll correct you. The LED in the flashlight is measured without secondary optics, if you need to get the parameters of the LED itself.
what do you mean? I can’t get your point.
you mean zooming in/out of the lens doesn’t matter?
If you need to get the characteristics (CRI, CCT) of an LED, you should measure it without secondary optics (lens, collimator, reflector).
