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

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

There are a few threads about measuring CCT or CRI, where the Opple Light Master got mentioned. 
But I love to just dedicate a thread to it, because it's quite a nice measuring device for people on a budget, and it deserves it.

Ok, what does it do: 

  • It measures Lux
  • It measures CCT (light color temperature)
  • It measures CRI 

And it's about USD 50 / Euro 40

 

Edit: I know it's probably nothing like a real spectrometer/spectrophotometer. But it might be enough for most people wanting to measure an approximate CCT and CRI

Edited by: ChibiM on 09/16/2021 - 10:02
ChibiM
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Hmm. so far, I like it. 

I only played with it for less than 30 minutes, and here are some of my measurements against the Maukka calibration lights I have. 

. . Light: 2107 Light: 2007
CCT Maukka 5933 3878
CCT Opple 5726 3904
Ra Maukka 79.1 94.7
Ra Opple 77.7 96.6

As far as I'm concerned, I'm pretty satisfied with this. 

I pointed the light in my integrating spheres and measured these 2 lights I have from Maukka. 

I didn't point directly to the sensor. 

 

For me, (for my reviews) the most important thing is to show in what CCT range a light is. Even if it's off by 10+%, I'm okay with that. It's more to show if it's 6500-7000K or 5000-5500K. 

I'm not 100% sure how accurate the CRI measurement is.

 

Here are some screen shots from the App

 

 

 

 

Edit: update: September 24

I did a side by side test, at 5 meters, compared the lux measurement manually with my Hagner E4-X luxmeter. 

I used the Hagner measurement as 100%, and then did the math. I wonder what everybody else gets.

Here are the results. 

  Hagner
Opple
Mode 1 275 cd 300 cd
  100% 109%
     = 9% higher
Mode 2 1375 cd 1575 cd
  100% 114.5%
     =14.5% higher
Mode 3 5000 cd 5525 cd
  100% 110.5%
     =10% higher
Mode 4 17000 cd 19000 cd
  100% 111.8%
     =11.8% higher
Thrower 59000 cd 65750 cd
  100% 111.4%
    = 11.4% higher

So, an average of about 11% higher than the Hagner. The 9% at the start and 14% at the second mode are not as consistent. 

Unheard
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Some measurements:

Osram KW CSLPM1.TG 5700K, aspheric lens, brightness:

Opple Lightmaster III 766 lx
Benetech GM1020 1019 lx

Some CCTs etc.

LED CCT Ra u v
SST-20 2700K / C01S 2680 98,5 0,2645 0,3498
LH351D 2700K / Wuben E05-I 2670 98,2 0,2635 0,3528
XM-L2 3000K / RRT-01 3055 84,3 0,2481 0,3482
219B sw30 / Utorch S1 mini 3111 96,4 0,2483 0,3432
SST-20 3000K / D4V2 2971 96,9 0,2508 0,3506
SST-20 3500K / C01S 3436 98,2 0,2378 0,3415
219C 4000K / C01S 3855 93,8 0,2281 0,3363
SST-20 4000K / C01S 4007 97,4 0,2249 0,3348
219B sw45k / C01S 4244 95,8 0,2250 0,3259

Shows PWM and ripple, no super resolution but usable within the limits of our vision.

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SammysHP
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Too bad it doesn’t show R9 and doesn’t save the spectrum to generate a proper report.

TMaxxJJ
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SammysHP wrote:
Too bad it doesn’t show R9 and doesn’t save the spectrum to generate a proper report.

But it’s cheap!

Shame it’s not available to the UK without extortionate shipping fees

Unheard
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I think it can’t measure the spectrum. It seems to use a CCD with standard color matrix.

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thefreeman
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Can you measure an incandescent bulb to see what duv it comes up with ?

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thefreeman wrote:
Can you measure an incandescent bulb to see what duv it comes up with ?

-0.0027

60W, probably higher duv after cleaning the bulb :D.

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jon_slider
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Unheard wrote:
-0.0027

thanks
not encouraging… since an Incan should have DUV 0.0000
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It’s useful for comparisons mainly. Absolute values can be quite off. Also, if you know the common binnings, you can find out which one you have. I find it very useful.

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mattlward
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I can’t find any of their products forsale in the US… am I missing something?

EDC rotation:
FW1A, LH351D 4000k (second favorite)
FW3A, LH351D 3500k
FW3A, SST20 FD2 4000k
FW3A, Nichia 4000k sw40 r9080 (favorite light!)
FW3A, Cree XP-L Hi 5A3
Emisar D4V2, SST20 4000k
S2+, XM-L2 T6 4C

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

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Europe and Asia only.

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id30209
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Where can i get it in EU? 

WTB Titanium 4sevens 2xAA tube

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mattlward wrote:
I can’t find any of their products forsale in the US… am I missing something?

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

ChibiM
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jon_slider wrote:
mattlward wrote:
I can't find any of their products forsale in the US... am I missing something?
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. 

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> 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.

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ChibiM wrote:

Hmm. so far, I like it. 


I only played with it for less than 30 minutes, and here are some of my measurements against the Maukka calibration lights I have. 



































. . Light: 2107 Light: 2007
CCT Maukka 5933 3878
CCT Opple 5726 3904
Ra Maukka 79.1 94.7
Ra Opple 77.7 96.6

As far as I’m concerned, I’m pretty satisfied with this. 


I pointed the light in my integrating spheres and measured these 2 lights I have from Maukka. 


I didn’t point directly to the sensor. 


 


For me, (for my reviews) the most important thing is to show in what CCT range a light is. Even if it’s off by 10+%, I’m okay with that. It’s more to show if it’s 6500-7000K or 5000-5500K. 


I’m not 100% sure how accurate the CRI measurement is.


 


Here are some screen shots from the App


 


 


 

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?

gchart
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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?

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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.

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How can this device measure CRI without reading the spectrum?

Where it can be found for 40eur?

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AEDe wrote:
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.
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SammysHP wrote:
AEDe wrote:
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;)

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AEDe wrote:
Where it can be found for 40eur?

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.

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ChibiM
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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. 

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jon_slider wrote:
> 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.

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.

EDC rotation:
FW1A, LH351D 4000k (second favorite)
FW3A, LH351D 3500k
FW3A, SST20 FD2 4000k
FW3A, Nichia 4000k sw40 r9080 (favorite light!)
FW3A, Cree XP-L Hi 5A3
Emisar D4V2, SST20 4000k
S2+, XM-L2 T6 4C

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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.

gchart
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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.

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

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jon_slider wrote:
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.


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.

Smile, you cannot kill them all.

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