LM561B+ 90cri question

Milky Weed said:

I gave up trying to figure out those charts lol it’s too hard comparing all the sheets

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MedicinalMyA$$ said:

Under 'Electro-optical characteristics' the CRI90 has a 'Special CRI (R9)' value of 50, whereas the CRI80 has a Special CRI (R9) value of 0.

"CRI R9 is one of the test color samples (TCS) used in the calculation of extended CRI. Many manufacturers will only report general CRI, however, which does not include the CRI R9 score. (See here for CRI extended vs CRI general). CRI R9 is therefore oftentimes a useful supplemental score to judge a light source's color rendering ability, specifically as it concerns objects whose reflectance spectra contain red wavelengths." LINK


"To define the term R9, first of all, it is important to understand what the color reproduction index is. The color rendering index is a classification system that measures the precision with which a light source produces the color of an illuminated object. Measures the ability of the light source to display colors of "tactile" or "normal" objects, compared to a familiar reference source, be it daylight or incandescent light. The color rendering index is an average based on R1 to R8. R9 is one of six saturated test colors that are not used to calculate the CRI.

Since you can find a percentage of the mixed red color in the different hues of most processed colors, the ability to reproduce with red precision is the key to accurately represent the colors of the displayed objects. High R9 lamps produce the most vivid colors.

The metric of the color rendering index is divided into 14 color regions from R1 to R14. The color rendering index is an average value based on the color ranges R1 through R8 of the metric, but does not take into account the remaining six additional color references. A high CRI, combined with a high R9 value, produces the most accurate color screen. LINK

"SEOUL, Korea – Jan 21, 2016 – Samsung Electronics Co., Ltd., a world leader in advanced components, announced that LM561B+, the company’s new mid-power LED package line-up with high light efficacy, is now offered with 3-step MacAdam ellipse bins and quarter bins across the range of all CCTs (from 2700K to 6500K), for use in premium luminaires. By leveraging the chromaticity control standard with the LM561B+, manufacturers will be able to make lighting products that deliver greater uniformity and consistency in light color without any visible difference in the color output between packages." LINK

So I think the CRI80 + CRI90 are designed to look the same to the eye except the CRI90 makes meat look fresher etc... and this addition is not reflected in the spectral charts?

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HippieDudeRon said:

Not uncommon for samsung to have an issue on a data sheet. Samsung's phosphors are all the same model to model so can go to another similar LED's data sheet and look at it's 90cri for reference.[/QUOTE
That is great news, I thought I was going crazy with like 100 tabs open trying to get to the bottom of this lol

Soon I will post links for cheap discontinued 90cri strips at arrow in case anyone is keen

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Meanmonsoon said:

"...and I can post links to 80cri strips for as cheap using lm561b aswell if anyone wants.
I figure they are great for side lighting"

https://www.arrow.com/en/products/lwa240-v024-enk/autec-power-systems

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MedicinalMyA$$ said:

Like THESE? I have 600W of them in a 4x4 they work fine for flowering too!

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Meanmonsoon said:

Exactly the series I was talking about!What a bargain you got man I missed that strip on my first order and got the 24 diode strips- half 3k and other half are the gen 1 4k lol. How many watts per strip are you running?

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MedicinalMyA$$ said:

About 10W, no heat-sinks, barely warm. I got about 200 of them when they were 83c each, and some boxes of 150W 48V drivers for $9 ea. Have four drivers each running 16 strips in 2Sx8P config for a total of 64 strips over a 4x4 literally wall to wall. Used the same cheap light meter that the Migro YT channel calibrated against a Apogee PAR meter to measure it, and I get roughly 8-900 PAR at about 8-12 inches from top of a scrogged canopy.

They aren't the most efficient but the whole light for each 4x4 area cost less than $100 and I get the PAR I want evenly spread over the canopy using about 600W so I'm happy. Plus now my garage, workshop, kitchen pantry and cupboards, and even tool shed are all very well lit lol.

Do you watch this thread? https://www.rollitup.org/t/samsung-...s-to-be-blowing-them-out-what-a-deal.1029150/

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Meanmonsoon said:

I like your style, the possibilities are endless lol. Wow man sounds like a great light setup regardless of been cheap and it is so cool you did all that for around the price of a magnetic 600 hps! Is not the far from efficiency of gen 2 bxeb when driven soft huh? Do you have a journal i could see your build?
Thanks for linking me that thread it’s awesome, I’ll probably see you around in there from time to time

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MedicinalMyA$$ said:

I don't post pictures on these forums. 'Pics or it didn't happen' is actually what keeps me safe, sorry to say.

Not really sure on exact numbers but on paper I think it works out to about 2.1umol/J although I hang the fixture quite close to the canopy.

Interestingly I worked out that using these 83 cent strips vs using higher efficacy $20 LM301B strips, driven at nominal, to get the same PPF over the same area (4x4), costs $50 vs $400 for the strips alone, not including heatsinks required for the LM301B strips. At 20c/kWh it works out about $150 cheaper per annum in electricity costs to run the more efficient strips 12 hours a day all year, or $3 a week. Which means it would take me 2 and a quarter years running them 12 hours a day every day, before they have paid for their extra expense - not including cost of heatsinks. Adding the costs of various types of heatsinking I figured it would take between 3-4 years of continuous 12/12 use before starting to realizing any savings in electrical costs.

The SAMSUNG ENGINE CALCULATOR tool is great for planning out builds.

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