Order fake LM561C's from Alibaba....

Viceman666 said:

One thing is never trust chinese seller.. but yes its true that 210lm/w is not likely to happen as it would be in near perfect environment I think most people are between 160-180lm/w but it really depends how hard you run them.. i dont think many here bought those strips..

Based on the datasheet you sent they were tested at 119lm/w which is very not that good.. dont know how you paid for them but probably not your best investment.. they are most likely not lm561c - in fact probably not even samsung LED.. sorry for you hopefully you didnt spend too much on it

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I don't trust no one I'm italian we are cheater from generation but this guy was advise to me from 2 icmag guys + led garden blog so I believe was genuine product.

I don't know what diode they are but I want to know.

After your answer I decide to continue the PayPal dispute and I ask all the money I spent = 300$ for 750w led stripes lm561c + 3 power supply 250w shipping incluse.

I hope to fix this situation and I have to test also if I don't like it because I don't have money to pay another light led or hps

i posted three images from another user who bought genuine diodes from digikey. you can compare them and make up your own mind which diode these BRIGHT strips could have. *it could also be a LM561Y.
your LEDs look like genuine samsungs to me. it could be any of those.
lm561C s6

lm561C s5

lm561b+ s5

here is another way to tell B+ from C:


maybe you could de-solder one LED and take a look at the backside. you could also supply it a specific current and check at what voltage it's running

Ok the diode (I'm not sure at all) is original I invert the color of the picture with paint and look like at LM561C S6 but why have the half of the power, how is possible start from 205 lm/w and finis to 119 lm/w ? stupid question: is even better than an hps 600w ? same watt , same room , same plants.

(I'm new here, is the first time i post here and all you guys make me feel accepted and help me a lot with a problem make le lose some sleep, be sure I'll help u all back how I can ^^)

do we have any lm561Y picture?

What I do not like is that resistor

205lm/w is absolute maximum with very low current. very unrealistic.
you should rather look at the samsung fseries gen3 which has 175lm/w (and is using lm561C) https://www.samsung.com/led/support/tools/engine-calculator/

so with the f-series gen3 you reach 202lm/w if you supply it with only 10% power (Design 1)
(Design 2 is default 175lm/w. 100% power, 65°C)
it may very well be a lm561C with 175lm/W, but with the losses by the resistors on your constant voltage flexible strips (which can be over 1/4) you already find yourself at ~126lm/w.
add some voltage drop because of thin copper and you are at the 120lm/w value from the PDF test report.

at least he found an Alibaba seller using LM561c lol

Nutria said:

at least he found an Alibaba seller using LM561c lol

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if the test report isn't fake

How many diodes for 750w he sold you for well be able to see how hard they are ran at

I'm looking at ordering the 600w kit from Meijiu, I asked for a closeup of the chips used and this is what I was sent, definitely look like LM561c, whether or not that's what I get sent will be another story lol

Nutria said:

at least he found an Alibaba seller using LM561c lol

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ahahah u are right the icmag guys told me, but I don't belive it because the lux meter give me a very low result and he send me 2 different data sheet.
I'm happy. I, and also you, find a reputable honest cinese seller (ps DHL shipping in 4 days to Italy) .
I have to say sorry if a doubt to this chinese guy, Alan . but was a very bad world and u can trust to no one, and also I was more ignorant than now to understand what the cinese guy tell me about it.and also thank you very much for your help I really appreciate to tazztone.

I kee you update I start the 12/12 as soon as possible.

tazztone said:

if the test report isn't fake

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if is original how is possible the led lamp do less than 119 lm/w?
I think I can trust now but I also ask a bit refound for the fake data sheet, the bad advise of Aland because I told him I have to grow plants and I need lumen and he give flaxible and not rigid and also current stuff , the 3M streep wasn't good but i'm happy the diode is original.

Viceman666 said:

How many diodes for 750w he sold you for well be able to see how hard they are ran at

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I have to check I will aswer

ildiocane said:

if is original how is possible the led lamp do less than 119 lm/w?

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it could be a LM561Y. no idea.
and he could have used another LEDstrip for the Test report.
you would have to be sure and have proof to get a refund.

anyway, it's not about flexible or rigid, but constant voltage or constant current. i was however hesitant to order even their constant current flex strips. but i found someone on another forum who ordered them and was happy.

for the bad 3M strip: you could use spray glue to attach them to a surface. or buy blue thermal transfer tape.

I think @ildiocane has constant voltage strips (looking at that resistor) and that is why there are lower lm/w readings. Can you post a better photo of your strips?

tazztone said:

it could be a LM561Y. no idea.
and he could have used another LEDstrip for the Test report.
you would have to be sure and have proof to get a refund.

anyway, it's not about flexible or rigid, but constant voltage or constant current. I was however hesitant to order even their constant current flex strips. but i found someone on another forum who ordered them and was happy.

for the bad 3M strip: you could use spray glue to attach them to a surface. or buy blue thermal transfer tape.

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Looking at this picture my diode look original, but u are right I need proof to refund and I give all the proof I have to paypal, I don't want all the money back if is original but more than half yes.
I find this tape amazon.it/dp/B01MXROKV9/ref=psdc_473601031_t1_B074PP4MHJ and I hope to find in some hardwere store for fix it fast, is a big job re fix 33 stripes with new tape at the same distance.

Nutria said:

I think @ildiocane has constant voltage strips (looking at that resistor) and that is why there are lower lm/w readings. Can you post a better photo of your strips?

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Yes u are right I have costant voltage stripes, but I ask best quality for plants grow..

Where are the fake weed pics grown with fake sammies at?

ildiocane said:

I don't want all the money back if is original but more than half yes.

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you mean because of the bad tape? i mean everything else is exactly like you ordered. you can't get 50% refund if you ordered the wrong product.

anyway, this is the tape i have and i am very happy. http://s.aliexpress.com/IJveI3QJ?
i used it for attaching my rigid strip to aluminum profile.

PSUAGRO. said:

Where are the fake weed pics grown with fake sammies at?

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I have to start the bloom phase and before fix the led lamp so I hope to start in 2/3 days , u can see the same led from the same seller on icmag google Lap does led diy and u will find ^^

tazztone said:

you mean because of the bad tape? i mean everything else is exactly like you ordered. you can't get 50% refund if you ordered the wrong product.

anyway, this is the tape i have and i am very happy.
i used it for attaching my rigid strip to aluminum profile.

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I have cutted the stripes, so I can't send back for refund I think and they don't want refund me with money for the bad tape, that make the strips fall to my plants that risk to die and burn if I wasn't here, and also for the bad advise of the product, I was a seller too and if I sell something that isn't good for my costumer I say sorry and try to fix the situation or give a refund. They offer me some glue and some stripes because some of their stripes have awry diode, that's it.

Is more or less the same tape but if I order to aliexpress I need too much time I think I take to hardware shop or amazon with prime I NEED to start bloom or my plants kill me are too big ahaha

All i can say is it looks pretty cheap the way it was soldered.. at 119lm/w I expect also a lot of heat from those strips.. so I dont know how you manage that.. i dont go on the other forums so I cant help you more but id recommend you look at pcb board instead.. or real samsung f-strips if youre into diy.. anyway good luck !

I read the first page and I'll be honest... I don't actually know if you got lm561c S6 or not, I don't know if you were happy with your grow under these lights or not.

so from what I understand 90cri performs slightly better than 80cri

Meijiu told me they can supply 304 lm561c s6 3k boards in 90cri

would there be any pros or cons to this?

Idk if they are original or not, I open a dispute with PayPal and was solved without give me back some money or tell me why, I'm feeling very bad about this, I trust to a person I think was nice and honest, and now I have something I have to fix (I have to glue it back the stripes) and spent other money (glue or biadesive) to use and also idk if work well.

Some guy here say "buy cheap , cry twice"
I'm not crying but I feel a bit stupid for trust to someone advise me that, and I trust it without make question or doubt and I also spent money for something without any certainty of the product.

I never ever make the same error, I hope I can resell or re use this stripes.

Thank you everyone help me with this bad situation I appreciate really much