CRI test and Mcree weighted results

[SSGrower]

There is a slight color shift, but looking at the various Mcree factors that were tabulated, shifting the spectrum via drive current will produce a much smaller variance than shifting from one K/CRI to another.

Thanks for the honest answer, stick with me here because I'm an every little bit helps kind of thinker....

The spectral distribution has the potential to change, there are many combinations of various light colors (combinations of monochromatic light) that will result in the same color temp. Now the question is what is ha]ening when additional current is applied - I believe it pulls up the peaks of the spectral distribution. Why would this be relevant? ....
The photons we are looking for reside on the slopes of this distribution and where they are will determine the degree to which they are increased. If we were lucky or good we would be able to selectively increase those wavelengths.

 

[ttystikk]

Thanks for the honest answer, stick with me here because I'm an every little bit helps kind of thinker....

The spectral distribution has the potential to change, there are many combinations of various light colors (combinations of monochromatic light) that will result in the same color temp. Now the question is what is ha]ening when additional current is applied - I believe it pulls up the peaks of the spectral distribution. Why would this be relevant? ....
The photons we are looking for reside on the slopes of this distribution and where they are will determine the degree to which they are increased. If we were lucky or good we would be able to selectively increase those wavelengths.

Why not do it directly with the phosphate doping,like every other chip maker?

 

[SSGrower]

Why not do it directly with the phosphate doping,like every other chip maker?

Would that I could but I am not a chip manufacturer. Gonna climb this hill with the shoes I have on.

 

[ttystikk]

Would that I could but I am not a chip manufacturer. Gonna climb this hill with the shoes I have on.

Gee, the cleats are right over there, clearly marked by size, from 2700K on up.

But go on wit' yo' baaaad se'f, screw up those nice dress shoes if you insist.

 

[SSGrower]

Gee, the cleats are right over there, clearly marked by size, from 2700K on up.

But go on wit' yo' baaaad se'f, screw up those nice dress shoes if you insist.

I don't own any dress shoes.
An informed decision is made when options are considered, evaluated and put into practice, 99.9 percent if the time this should result in failure. Don't be affraid to fail.

 

[ttystikk]

I don't own any dress shoes.
An informed decision is made when options are considered, evaluated and put into practice, 99.9 percent if the time this should result in failure. Don't be affraid to fail.

Lol you're talking to the original gangster of 'not afraid to fail'.

 

[SSGrower]

I know

 

[hillbill]

It is good to know that these days with present cob technology, we are examining spectrums that will all hammer hid lighting. The differences between most high grade COB's is tiny compared to hps and mh.

The most tech savvy and knowledgeable members knock these numbers, ideas and concepts around and can be a great source of info for some like me to tune and tweak their lighting and area.

Electronics and lighting is not a hobby or interest to me apart from plant lighting and these discussions help me to provide a fact-based environment for the herb. Thanks.

 

[PhotonFUD]

Would that I could but I am not a chip manufacturer. Gonna climb this hill with the shoes I have on.

I had to think about that for a bit. Now it kind of makes sense.

Are you asking what the impact of different currents is on spectrum shift to see if it should be factored in as well? For example running at 10% nominal versus 25% nominal current results in a x nm shift to the right. If so that would make sense as significant shifts may results in different outputs. It might be another advantage (or even a disadvantage) for running higher number of emitters softer.

Requires study. Component vendors will benefit if it makes sense to put more capital upfront into emitters.

 

[SSGrower]

I had to think about that for a bit. Now it kind of makes sense.

Are you asking what the impact of different currents is on spectrum shift to see if it should be factored in as well? For example running at 10% nominal versus 25% nominal current results in a x nm shift to the right. If so that would make sense as significant shifts may results in different outputs. It might be another advantage (or even a disadvantage) for running higher number of emitters softer.

Requires study. Component vendors will benefit if it makes sense to put more capital upfront into emitters.

Dingbo or more precisely bingo, that's it.

 

[JorgeGonzales]

Are you asking what the impact of different currents is on spectrum shift to see if it should be factored in as well?

The impact is completely insignificant in white leds, because it's completely insignificant in the ~450nm LEDs driving them.

How many times can you hear the same answer?

 

[SSGrower]

If you have the numbers to prove your statement the post them.

 

[PhotonFUD]

The impact is completely insignificant in white leds, because it's completely insignificant in the ~450nm LEDs driving them.

How many times can you hear the same answer?

That would be the first time for me. I was first looking to make sure what the poster was asking so I could go research it properly.

Significance is most certainly the question to see if it is worthwhile. You answered that quite emphatically and I haven't yet found anything to the contrary.

 

[JorgeGonzales]

If you have the numbers to prove your statement the post them.

Prove it yourself. I'm not here to take a picture of the sky for you to "prove" that it is blue to you.

 

[JorgeGonzales]

That would be the first time for me. I was first looking to make sure what the poster was asking so I could go research it properly.

Significance is most certainly the question to see if it is worthwhile. You answered that quite emphatically and I haven't yet found anything to the contrary.

@SSGrower has gotten the same answer from three people now, I assumed you had read the responses. Apologies.

 

[Rahz]

I have read that the shift isn't significant prior to this thread, perhaps it was @alesh who mentioned it. I can't speak directly to the shift but for instance, with the results of the Mcree factors I tabulated when we shift the color from 3000K/70CRI to 3000K/80CRI the "Mcree efficacy" changes from 78.034 to 78.229 which is in itself fairly insignificant. It can be assumed that any color shifts in the same sample due to current would be more so insignificant.

 

[JorgeGonzales]

I have read that the shift isn't significant prior to this thread, perhaps it was @alesh who mentioned it. I can't speak directly to the shift but for instance, with the results of the Mcree factors I tabulated when we shift the color from 3000K/70CRI to 3000K/80CRI the "Mcree efficacy" changes from 78.034 to 78.229 which is in itself fairly insignificant. It can be assumed that any color shifts in the same sample due to current would be more so insignificant.

Since it's you asking:

Manufacturers provide dominant wavelength vs current charts in their data sheets, royal blue doesn't really budge.




If you want empirical testing, check out @Malocan's spectrometer thread, which I keep coming back to for stuff like this. He tested a 3500K CXB3590 and it moved from 3460K to 3497K between ~25W and 105W. So about 1% after quadrupling the wattage, good luck exploiting that in any meaningful way.

 

[SSGrower]

There that's it. I know it will be tedious and potentially unrewarding to map it out for all chips. Lacking a unified theory of relativity, proof lies in the measurements which I am unable to take.

Can you post a link to the thread you are talking about?

I don't plan to buy any more chips in the near term but as advancements are made in semiconductor tech I would like to remain informed.

 

[ttystikk]

Since it's you asking:

Manufacturers provide dominant wavelength vs current charts in their data sheets, royal blue doesn't really budge.

View attachment 3776836


If you want empirical testing, check out @Malocan's spectrometer thread, which I keep coming back to for stuff like this. He tested a 3500K CXB3590 and it moved from 3460K to 3497K between ~25W and 105W. So about 1% after quadrupling the wattage, good luck exploiting that in any meaningful way.

As an engineer, a good solid 'no' can be a very valuable thing.

 

[Stephenj37826]

Since it's you asking:

Manufacturers provide dominant wavelength vs current charts in their data sheets, royal blue doesn't really budge.

View attachment 3776836


If you want empirical testing, check out @Malocan's spectrometer thread, which I keep coming back to for stuff like this. He tested a 3500K CXB3590 and it moved from 3460K to 3497K between ~25W and 105W. So about 1% after quadrupling the wattage, good luck exploiting that in any meaningful way.

Even with the lowest step chromatic bins there is variation so yeah I ding think about spectrum one bit when deciding drive current.