Thanks for the update.
Disappointing, but thanks for the update.
As long as you are working on it, that is a positive.
!@#$ happens, I understand. Thanks for keeping us updated.
So, the app updated, any fixes?
I’d take an iterative way of updating ,first try to improve accuracy of color rendering index, eml and circadian stimulus.
I also want to upgrade firmware to elevate accuracy in low lux environment, but now decide to postpone it because I need cooperation. maybe next iteration.
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My Opple app was updated on June 1st, but the R9 values for high CCT lights are still inaccurate.
I believe the main drawback of the Gen4 is the inaccurate R9 values found in high CCT (above 5000K) lights, especially for flashlight users like us.
Ra is still not equal to (r1+…+r8)/8.
But something is changing. 519A 3500k: cct 3470k->3340k , R7 34->77 for example.
Could you tell which algorithm to calculate ra you use? Is it some open library? Or your own? Mathematically it is not big science , so we could help.
How is it done with a finite set of sensors? I always thought one needs to interpolate a reference spectrum to reflect features like the cyan dip in most LEDs.
Yes, interpolation. Maximum at 450-460 can be used as additional information for this interpolation. Spectrum of LEDs is smooth so iit is not difficult problem.
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Not all of them, I’ve seen plenty with complex spikes in the blue region.
mine too, but that was not the update we are waiting for
the only thing I can see that changed, is they added a watermark that says Opple, to the first screen that shows lux and duv, etc.
The CIE Spectrum chart to the right of that, that shows the BBL and a Dot to represent the currently tested LED, still does not update. It does not change at all, no matter which LED is tested.
Also the DUV values are still off, they read high by 0.0015 to 0.0030 points. Opple 3 is still more accurate for XY coordinates that produce the calculated DUV.
R9 results are still totally wrong for Low CRI lights, for example, on a light with CRI Ra of 60, it gives R9 of 100! totally worthless…
It would be great if the June 30 update would fix the DUV error so the results match the Opple 3, and activate the CIE spectrum chart, that already works on Opple 3.
It would be even better if the R9 values were closer to accurate.
The Opple 4 is totally useless to me. DUV is not accurate, CIE chart does not work, and R9 CRI is totally wrong.
I only use my Opple 3. The DUV is more accurate, even though I have to go to waveform to plot and calculate from XY coordinates.
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The app interacts with other opple products also so we can’t assume that all updates are for the lightmaster.
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Maybe but it is very exotic. Work with ordinary 445-460nm pumped led would be good enough.
there are several ways to calculate Ra, the algorithm itself is no big deal. but I am not authorized to tell.
the LM3 team left during company reorg without a good transition, that caused much trouble to the product development.
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LOL, should have paid them more.
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Is the CCT measurement on LM4 accurate enough to be useful at this point?
Thinking of grabbing one due to Ali sale since I don’t have any measurement tools and would like to check my lights. Just optimistically thinking the duv numbers will be fixed sooner or later.
Yes, for High CRI lights, LM4 CCT is useful:
The CCT on Opple 4 is 5191
The CCT on Opple 3 is 5154
a difference of less than 1% (insignificant)
No, for Low CRI lights, LM4 CCT might not be useful, depends on the LED:
the CCT on Opple 4 is 8597
the CCT on Opple 3 is 6466
a difference of 33% (quite large)
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I’m giving up on the Opple Light Master 4 – and maybe version 3 as well. It is completely inaccurate, and the inaccuracies are all over the place. I have an X-Rite colorimeter and will be looking into ways to use that instead.
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