Opple Light Master III (G3) discussion thread (Cheap device for measuring Lux, CCT + CRI)

Flashlight Modding and DIY Parts
387

@Lojik

If you haven’t purchased the LightMaster 2 yet, wait it out some. Their prices seem to wander and being this is a new release, the LMPro price is steep. I got mine for ~ $21 USD after some 4 months this thread first came by. I had missed an opportunity somewhere after 2 months, but it does go ‘yoyo’.

As Jon pointed out, we find different uses for the device, none that we had ever forethought of. I too check on the overhead lighting and some of the crappy lights in my “lost” drawer. The Flicker index is not critical but useful.

388

Thanks so much for the tip. I think I will hold off and do that. If I do see it come up again for $20-ish bucks or so, then I’ll see enough value in it for me. Right now I can wait and not feel like I’m missing anything. Thanks again

389

Was wondering if there’s any difference between 2 and pro hardware wise. Some searching on the net revealed the following.

Series 2:

Pro:

They seem to use an entirely different sensor and controller/BT interface. Series 2 sensor looks a bit like an AMS TCS34903FN (red, green, blue, clear and IR), but could be something else entirely as well.

390

Just want to confirm that Opple Pro/Series 3 is once again available. I ordered from the official store on Aliexpress and it took a mere 10 days (!) from China to my house in LA. It’s brand new and working as expected.
The 1lumen review Cheap device to measure color temperature of light / flashlights (Opple Light Master 3 PRO ) is a good read on how to get started. Make sure you turn on “location permission” for the Opple app on your cell phone.
And this is the site where you calculate Duv Calculate Duv from CIE 1931 xy coordinates | Waveform Lighting

If you’d like to get one, just make sure it’s the item on the right side of the 2 pictures on the web site https://www.aliexpress.com/item/3256803116495145.html?spm=a2g0o.order_list.0.0.4f2f18026hLcUc, where under “Color” it will say Pro (please don’t ask me why it’s under “Color” lol ). The other way to tell is of course the Pro is more expensive, ~$40.

391

Cool, thanks for confirming that it's the PRO / III

It looks like they shipped the EU version (III) instead of the PRO version (which is the same, but different packaging)

392

Does anyone ( @jon_slider ?) have Opple reading of Nichia 519a 4500k’s Duv (before dedoming)? All my other Nichia LEDs’ numbers are fairly consistent with known specs, except the 519a is unexpectedly giving a negative Duv even with several rounds of testing. That surprises me as numbers from Simon/Convoy indicate it “should” be positive.

OTOH looking at the color of the chart below, it does seem consistently accurate to what I see. More yellowish than magenta’ish and hugging BBL closely.

519a 4500k

219b 4500k For Comparison

Beamshots of the LED’s
! !

393

the white numbers are my Opple
the black numbers are a different persons Opple
.

you can see his domed 4500K measured much lower than mine…

he did not share a photo of the beams he was comparing

I agree your sw45k values are in the ballpark, Ive seen 80-120 depending on the DBin… aka D180, D200, D220 (less pink more output)

and I dont think your –0.0018 is necessarily wrong… LEDs vary… so do our measuring techniques… higher output has lower DUV… etc

here is one of my domed 4500K that measures almost identical to yours:

394

Ok thanks - consistent enough.
I’m getting Duv range for 519a from ~ –0.0019 to –0.0044.

395

You left out some info which generally effects measurement of LEDs quite a bit: tir optic/reflector/bare led? what current are you measuring the LED at?

Without that info your measurements are close enough to my own (also from Convoy) to be believed.

396

I measured a 519a 4500k w/ dome from Convoy on my Opple.

This was with 3A of drive:
CCT: 4416k, duv: –0.0081

FB

397

Should have also said…

At 1A drive:
CCT: 4515k, duv: –0.0020

Measured on Opple.

FB

398

Thanks - good points. I tested with Sofirn clear optic but didn’t think about bare LED. Now that I know what’s involved, will be more complete next time.

519a 4500k in Convoy S21D with Sofirn Clear Optic (the OEM frosted optic’s numbers didn’t change much). Tested at center of beam.
100% Brightness: Duv –0.0037
20% Brightness: Duv –0.0019. Other runs ranging –0.0020-0.0030
CCT similar to yours ~ 4100K

399

Need to include if this is with a reflector, optic, or bare LED.

For example, a reflector will typically be higher Duv and CCT than a TIR optic.

As drive current increases you will also see it trend lower in Duv and higher in CCT.

400

By this you meant as current increases Duv is less negative, heading towards positive (becomes more greenish etc.)?

Thanks everyone for the helpful info.

401

More current, more negative. (Less green)

402

Thanks.

I like it that your ArgyllPro reads R9. Is this the one you have? Amazon.com

403

more options here:

404

I have the old colormunki photo from this link. I got mine used from ebay. AFAIK it’s the cheapest way to get a real spectrophotometer. However once you see the cri and spectrum of a specific CCT of LED the opple seems to give you a ballpark of everything else that varies more.

405

> colormunki

far superior to Opple as colormunki has full CRI data, including CRI R9 and R12, and is more accurate overall.

but afaik, colormunki requires pairing with a computer and special software… Probably good for people that use PCs and command line interface… I dont know if it runs on a Mac…

Correct me if it runs on a GUI…

406

I use ArgyllPro app on Android but it’s a $99 app and there is no iPhone version.

However, it plugs directly to phone and allows me to walk around and the app has everything I care about in one screen.

Ymmv very niche app