19V on a 12V strip is killing them - no matter if he is using PWM or not.
19V on a 24V Strip will barely light the LEDs up and they will pretty much live forever 
12V Stripe on 5V Powerbank doesn’t work - 3 LEDs in series need ~7-8V to light up a tiny bit.
Wow their WW 3000k actually has a negative DUV value and 93.53 R9!!! I’ve been searching for good led strips for my home decor and all the Amazon ones I bought have very yellowish/greenish tint. I would love to buy a 3000k one but they only sell NW 4000k-4500k and CW 5500k-6000k.
No, they also have the warm white! For some reason it is not listed there, but here is the link:
https://www.aliexpress.com/item/MARSWALLED-High-CRI-RA-95-LED-Strip-Light-SMD5630-Super-Bright-Warm-White-Nonwaterproof-2800K-3200K/32864940172.html
*Note that the measuments on the pics I posted show CRI97 for the warm white(!) and CRI95 for the daylight white.
Well, guys, he actually connected 2x12V LED strips in series, then to reduce heat output and boost efficiency, he put 19v instead of a 24V power supply. Then he uses PWM to reduce power even further.
He wouldn’t be that dumb to power a single LED strip with 19V+PWM. That is why he put 2 in series. Watch the whole video, and you will understand.
Ah nice thanks!
Thanks, exactly what I wanted to know.
I understood that but, at first, I though Lexel had not. I was going to explain this to him, but then I tried to think.
He stated:
Undervoltaging means more current (since the resistance does not change), right? As he stated, more current = color shift.
So, I think he meant undervoltaging a 24V LED system to 19V means more current, so tint shift. Did I understand right?
Undervolting means less current - until the LEDs don’t light up at all.
The forward voltage of every LED gets less if you lower the current - and vice versa.
Visualisation:
The more current you want, the more voltage you need
The more voltage you want, the more current you need
So, if you give the LED which this graph is about exactly 3V, it will draw ~75mA. It is impossible to run this LED with 3V and 300mA.
24V LED-Stripe on a 19V Power Supply means lower current, therefore a tint shift.
PWM dimming doesn’t affect the tint as hard as dimming via current does, but it does.
Understood, thanks for the nice explanation and graph! I was stuck with Ohm law, U=Ri but apparently the resistance of the LEDs are not constant.
But aren’t these leds connected with a much higher resistor in the strips? I thought that this much higher (and fixed) resistance is the one who will determine the current through the strip?
Just a short note: These are large LEDs so there are ‘only’ 60 LEDs per meter.
For some illumination purposes you will see single spots at closer range or the reflection of dots on shiny surfaces.
There are other strips with more smaller LEDs, like this (240 LEDs/m).
Found another 90CRI strip. I asked for the 3000k version and they showed me a test report showing x=0.4275 and y=0.3814, which calculates into a DUV of –0.008, which is very nicely rosy! Perfect for the living room or bedroom use!
Holy crap. An R9080 LED strip. That is dope AF.
The only thing disappointing is the low R12, and the efficiency of 61lm/W.
That last one was expected though at 4000k and R9080 LEDs.
The question is: how do you know it’s real?
One thing that doesn’t add up is efficacy. Half of what is in the description.
But if it really does what they say, that’s a nice strip.
61lm/W
good God…
That’s why I don’t buy chinese LEDs anymore - efficiency-wise they stand still for the last 10 years.
The Samsung LM301B are over 200Lm/W and some other LEDs are very close to 100CRI/Ra - It’s just a matter of time until they get combined.
That said, the 80CRI of the LM301B is not bad, I have several 4000K modules, but 3000 and 5000K as well - I would use them for house lighting anytime.
Where do you buy the Samsung strips? Are there test results? Wjere do you find led strips with 100CRI?
Im interested not just in the CRI or R9, the tint is just as important if not more. I cant stand yellowish greenish tint. It needs to be under BBL for me and the ALI one I posted has a DUV of a whoping –0.008. That might be the reason why the efficiency is not good. It is like a Nichia 219B 9080. Beautiful tint but poor efficiency.
I never wrote something of stripes 
https://www.led-tech.de/en/21x-Samsung-LM301B-stripe-4000k
8.7W 1545Lm
High CRI for example the Seoul SunLike with CRI 97
COBs, yes, but it shows, that a high CRI isn’t impossible.
There are manufacturers of stripes on AliBaba, but none of AliExpress.
I don’t really understand, why.
If the Samsung LEDs were R9080, I would have believed you.
But they are only 80CRI, and they are bigger die LEDs than the LEDs from the other R9080 strips.
You can’t really compare them together.
Doesn’t change anything about that LEDs with 61Lm/W are not worth buying in 2018.
These are not LEDs but strips with current limiting resistors. Possibly driving the LEDs at more than optimal current. At 3000K CRI 9080.
61 lm/W is not really good, but it’s not particularly bad.
You cannot compare efficiency of LEDs with LED strips. The resistance (losses) through the strip is tremendous. It’s like comparing the horsepower at the crank vs at the wheels but many times worst. Many of these 16.4’ strips actually have visible dimming at the end of the strips due to resistance losses. To me the tint is even more important than CRI for interior lighting and most of the ones I bought were too yellow/green or did not have enough red/rosy tint in them for my tint snob eyes. During my house remodeling I bought about two dozen different types of LED strips from Amazon and local stores including cheap and premium brands and weren’t happy with any. I then found a random low cost $10 strip from a website I never heard of at the time (Aliexpress) and bought it. It was the brightest and best tinted (not sure about CRI) led strip I’ve seen yet so I ordered another 10 because I used it in all my rooms and kitchen.
Now if anyone know of any LED STRIPs with good tint (negative DUV) and 90+ CRI with better efficiency or higher brightness than the ones posted above, regardless of price, please post. I’ve looked hard for LED strips and even tried the expensive stuff but still haven’t found any ideal LED strips.
I took a look at the data sheet of the Samsungs and looks like they will be averaging above the BBL so it’s going to be on the green side unless you can select tint bins. I’m guess this is similar to the high cri Cree emitters that are famous for having the highest efficiencies but piss ugly tint.