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

Correct, I don't think it's available (yet) in the US

Europe and Asia only.

Where can i get it in EU?

https://www.amazon.de/Opple-Lightmaster-G3/dp/B08R7G17VG/ref=sr_1_1?\_\_mk_de_DE=ÅMÅŽÕÑ&dchild=1&keywords=Opple+Light+Master&qid=1631880405&qsid=258-6520096-8745416&sr=8-1&sres=B08R7G17VG%2CB000ONNOH4%2CB08KDHHPFH%2CB07MM37QSW%2CB07Z7YM3PD%2CB01N91B9WR%2CB082QHRZFW%2CB07L755X9G%2CB000KPW8WI%2CB07WMMLJFZ%2CB07PK8LSK6%2CB08XVQQ14Q%2CB082B7ZTRZ%2CB083DC9J5M%2CB08P6P6VGL%2CB09836NKMC%2CB0016PRABA%2CB07MSJCPR4%2CB000JTIX3S%2CB004AVIHKK

I wrote to Opple Europe, they told me to contatct Opple China

China gave me an Ali link:
https://www.aliexpress.com/item/1005003302809897.html

I thanked them and let them know the price is double the European price

bottom line, Im not a buyer, since it is not accurate enough for DUV… and has no R9 info

I'm using it mostly to determine CCT, and the extra ability to 'measure' CRI is really nice.
Just wondering what you need the DUV for? If it had all those abilitites, really cool, but that's probably only available in handheld devices of $500+?

Been eyeing a Gossen Spectromaster, but they are like 20 times this little device.

> what you need the DUV for?

it tells me the tint of the LED (I dont mean the color temperature).

tint is a major deciding factor in my LED selection… I intentionally do not buy LEDs with DUV above the BBL

Im much less concerned about color temperature. I can pretty easily figure that out by shining a light on a wall that is illuminated by an incandescent bulb (3000k), or by one of my flashlights LEDs with a known LED color temperature such as 4000k.

It has become pretty easy for me to know when Im looking at a sample that is either cooler or warmer than one of my reference lights.

there are many LEDs that can claim High CRI, but they can have green tint.

there are also many LEDs that can claim High CRI, but they can have very low Red CRI R9

for me, the Red CRI R9 specification is a Major and usually overlooked criteria, that helps me decide which LEDs to buy.

so Im not tempted to buy an Opple, since it is not accurate for DUV, does not offer CRI R9, and I dont need a device just to determine color temperature… thats pretty easy for me.

I also dont like the Ali price being double what you guys pay in Europe.

You wrote in another thread that Opple told you the Light Master Pro version (see https://ifworlddesignguide.com/entry/282367-lightmaster-pro) would be identical with the Light Master III. The picture in the ‘iF world design guide’ clearly shows R9, Rf, Rg values on the app screen. Is this just a different software version if the hardware is identical? Did Opple clarify this?

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Hmm. I wonder if it’s just a different app? That AliExpress listing calls it the Light Meter Pro G3 and the product is labeled “pro” on the bottom. Perhaps it can measure R9 but the app just doesn’t have it displayed?

I don’t think there’s a “Pro” model (yet). Those Pro-images are around since I bought the Opple months ago. Asked Opple and got no answer. Also, the naming is inconsistent. Sometimes it’s called Lightmaster III, sometimes it’s Lightmaster G3. The App is called Lightmaster Pro.

I bet someone was working on an improved model, maybe using a CCD with more suitable color filters, and hence the renderings and the made-up app pictures with R9. But I bet it would have been way more expensive with customized CCD, more in the range of other devices of this kind.

Another point: Let’s not seriously discuss the precision of the CIE diagram location. Mine was, iirc, 40 EUR. It’s fun, it’s useful in cases I stated above. But of course it is no scientific tool.

How can this device measure CRI without reading the spectrum?

Where it can be found for 40eur?

A monochrome sensor and a set of filters of the reference colors R1 to R8.

Filters transmitt spectrum. But the same color can has different spectrum. It is called metamerism.

But anyway thanks, this assumption led me to the right idea;)

There’s a link in this thread. Some german webshops also carry it. See if you find one that delivers to Russia with moderate s&h.

I downloaded a few of the older APK files, and none of them has the dark theme, with R9 measurement.

It's probably just a software thing, but not available to us, users.

Jon, I really agree with you. Not having accurate’ish DUV or R9 is the issue. CT are easy to make an informed guess about, still, but to a lesser extent after having looked at so many it is fairly easy to decide where the DUV is more or less. Camera shots with right WB and again a good eye will tell you a bunch on a calibrated screen.

Because Im also interested in comparing the flicker score of various LED light bulbs I have bought, I decided to contact Opple and have ordered one for delivery to USA

you all can wait for my review, or go ahead and open your wallet

here is the purchase link I used
opple from china to USA

I have no affiliation of any kind… I paid the price shown in that link (about $35 w shipping), for the one I just ordered. Will post impressions after it arrives.

Holy cow. $31 after coupon and shipping? That’s a pretty good deal for what it advertises to be. It may not be a professional-level tool, but according to the test results that have been posted here so far, it seems to do what it claims to do.

That’s what I consider a deep discount for a unique tool.

Congrats for finding it at this price! I’m sure you’ll like testing it. I’d be interested about your findings regarding lux measurements. I found some deviations from the Benetech GM1020, but that’s surely not a reference device.

This Opple is sold to professionals, and part of the job is measuring brighness. So, it should be good at that, taking into account there are standards about e.g. office/workspace brighness values.