Yeah, that’s of relatively limited use as it’s not realtime without root. I need to sort a few things out first (like getting a reasonably usable root phone since my current one is really old due to the phone that should have replaced it as the burner root one ending up broken when already close to planned retirement) then I’ll be able to get some better insights.
If anyone wants to coordinate on this effort, send me a DM.
I really wish Spectrometers are not this expensive… Even from Taobao direct it’ll be $450
https://www.amazon.com/Hopoocolor-OHSP350C-Spectrometer-Handheld-Tester/dp/B09PZSWZW2?th=1
Look what I found on Amazon while looking at the Hopoocolor… OPPLE Light Master 4 Light Meter
Very cool. 1 day delivery even.
Fwiw, if someone is looking to off load their lm4 let me know.
At this point, I would wait to see what they can do to fix the problems…
looking forward to the update
I have put a reminder in my calendar… 
June 30th
Have you decided if there will be a second hardware version of the Light Master 4?
as far as I know, there is no second hardware version of LM4. we try to improve current version of LM. some posts above said they measure light with green tint or other tint, we actually didn’t use those kinds of lights for calibration, but LM3 did support those measurements.
We like to use the LM3 to calculate the duv (delta u, v) to see if a LED produces a beam with a green tint (e.g. + 0.05) or a rosy tint (e.g. - 0.05). For example a Samsung LH351D 5000K (green tint) vs a Nichia 219B 4500K D220 R9080 (rosy tint).
@stevechang
So you have pushed the date out for another month? Original statements said three updates. May 30, June 30 and July 30.
Now, nothing until the end of June?? OK, but it would be nice to know the plan.
Also, is the plan still to make 3 incremental releases?
Will we see any updates to the Light master 3 App? We would like to add a simple calculation to it to display DUV easily
good point, Flashlight LEDs are not always full spectrum, and are often very low in R9, which the Opple 4 cannot measure (yet)
Here is an example of a Fenix E05 on LM4 and LM3:
you can see there is a very big difference in the results
the Opple 4 does work better with the High CRI LEDs.:
in this next example, the difference in X and Y coordinates is much smaller:
I also recommend you consider having TimMc help test the Opple 4 app revision for you. He is highly skilled, and very helpful. I nominate him as our Flashlight Ambassador to help Opple understand our niche interests a bit better.
Sorry, project manager arrange this because the app team has their schedule. I want to make incremental releases, but I have to consult with them.
thank you for your suggestion.
no hearing of updates to LM3 app
Please do upgrade also for LM3 app if it’s possible
Second hand X-rite i1 Studio or Colormunki Photo on ebay for example, they can be found as low as 100~150 $/€. It’s the cheapest option and a good one, used with ArgyllCMS (free), the SPD can be exported to use in other softwares like Osram Color calculator (many spectrophotometers can’t).
oops, time for app update changed to 7.30 due to schedule arrangement by product manager.
I feel sorry for this arrangement.
Not good news, but thank you for keeping us updated.
