Order fake LM561C's from Alibaba....
- Thread starter conversekidz
- Start date
dandyrandy
Well-Known Member
I bought 6 from Washington. I replaced original oem 100v QB boards which have a very prominent black dot. They don't sell these anymore. These 50v boards at the same power as the 100v boards are much brighter. I believe the old ones are 561b's. These 48v boards are supposedly 561c s6. Would they be noticibly brighter I wonder. Has led numbers silk-screened on boards. Such as led 1 thru ... They are quite heavy as far as the aluminum and copper amount. They did not quite fit my old slate heat sinks.
conversekidz
Well-Known Member
*removes the vale of fake for this post*
Lets clarify something....
The LM561B is easy to identify compared to a LM561C, the side notch on the LM561B is the dead give away. Additionally the LM561B lacks the dog eared corners of the LM561B+ and LM561C. If you cannot find a spec sheet and tell the difference between parts, you really should not be building any electronic project.
When people state fake LM561C S6, what they are really stating is "the LED that the fine gentleman or lady in china sold you is not a LM561C S6, because good sir you have been dooped and they in fact sold a lowly LM561B+...HAHAHA GOOD SIR YOU HAVE BEEN FOOLED, LET ME POINT AND SCOFF AT YOU"
At a certain point we are splitting utter hairs on the efficiency arguments at the scale of grows that are happening in the LED forum.
Pushing the LM561B+ to the limit and giving the LM561C a little headroom to limit we get the following. At .065 amps there is a 5 watt difference between the two 288 led case studies. Assuming the two panels are ran 24x7 for 90 days the difference of 5 watts would equal 10,800 watts of power the LM561B+ will spend in excess over the LM561C. Assuming you have a .25 cent per kWh, you would have a bank breaking $2.70 in additional power costs.
and lastly
@ILikeBigBudz87
Here is the ever growing stack of cheap Chinese power supplies that last less than a day....the vendor on amazon keeps ship them to me each time they burn up. Do yourself a favor and your neighbors around you, don't cheap out on the electronics that have a high possibility of starting a fire. Power supplies hanging in a highly combustible tent is never a wise idea, if you are going to do such a thing at the very minimum get a power supply that is IP67 rated.
*Replaces Vale of Fake*
Damn....what just happened....must be all that fake weed
Lets clarify something....
The LM561B is easy to identify compared to a LM561C, the side notch on the LM561B is the dead give away. Additionally the LM561B lacks the dog eared corners of the LM561B+ and LM561C. If you cannot find a spec sheet and tell the difference between parts, you really should not be building any electronic project.
When people state fake LM561C S6, what they are really stating is "the LED that the fine gentleman or lady in china sold you is not a LM561C S6, because good sir you have been dooped and they in fact sold a lowly LM561B+...HAHAHA GOOD SIR YOU HAVE BEEN FOOLED, LET ME POINT AND SCOFF AT YOU"
At a certain point we are splitting utter hairs on the efficiency arguments at the scale of grows that are happening in the LED forum.
Pushing the LM561B+ to the limit and giving the LM561C a little headroom to limit we get the following. At .065 amps there is a 5 watt difference between the two 288 led case studies. Assuming the two panels are ran 24x7 for 90 days the difference of 5 watts would equal 10,800 watts of power the LM561B+ will spend in excess over the LM561C. Assuming you have a .25 cent per kWh, you would have a bank breaking $2.70 in additional power costs.
and lastly
@ILikeBigBudz87
Here is the ever growing stack of cheap Chinese power supplies that last less than a day....the vendor on amazon keeps ship them to me each time they burn up. Do yourself a favor and your neighbors around you, don't cheap out on the electronics that have a high possibility of starting a fire. Power supplies hanging in a highly combustible tent is never a wise idea, if you are going to do such a thing at the very minimum get a power supply that is IP67 rated.
*Replaces Vale of Fake*
Damn....what just happened....must be all that fake weed
skoomd
Well-Known Member
I seriously can't agree enough on the power supplies...
It's what is converting a 120/240v low amperage AC signal into a low voltage, super high amperage signal.
That is a hefty undertaking when talking about the wattages we use in our lights. And not being IP67 rated is a huge no no.
Essentially, it's pretty much the only thing that can explode and burn your house down, assuming you dont leave exposed wiring.
Spend the 50-120$ for a meanwell driver that has a 7 year warranty and an unmatched reputation for building safe, high quality drivers for LEDs.
You wouldnt buy a super cheap 20$ chinese HPS ballast would you? No, any sane person would get a good one.
It's what is converting a 120/240v low amperage AC signal into a low voltage, super high amperage signal.
That is a hefty undertaking when talking about the wattages we use in our lights. And not being IP67 rated is a huge no no.
Essentially, it's pretty much the only thing that can explode and burn your house down, assuming you dont leave exposed wiring.
Spend the 50-120$ for a meanwell driver that has a 7 year warranty and an unmatched reputation for building safe, high quality drivers for LEDs.
You wouldnt buy a super cheap 20$ chinese HPS ballast would you? No, any sane person would get a good one.
Big Green Thumb
Well-Known Member
Check the inrush thermistor. That is what has failed on 2 of mine. $1 for a replacement and about 20 minutes time.
conversekidz
Well-Known Member
Yup that is what burns on them, it also takes out the Tenta X2 safety cap next to it.
conversekidz
Well-Known Member
Never said i could spell
conversekidz
Well-Known Member
Or maybe it was a fake Veil I had on....Never said i could spell
Viceman666
Well-Known Member
Nice post! However at the end of the day the concern is you cant just compre a b+ and C s6..your seller from alibaba tells you they are legit lm561c s6 and ship you a b+.. first lie.. then you tell them its not C s6 because you were able to see.. they come back and reconfirm its C s6.. at this point you just stop arguing with them because you know they dont care.. fine.. my main concern is if they lied about the led they use they may have as well lied on the bin they use.. so maybe b+ s4 or s5 or whatever other lower bin there is.. ant not s6.. if you use the calculator the same way you did and change to lower s5 or s4... the difference jumps from 5-10% when comparing s6 b+ to s6 C to maybe 20-30+% difference in lumens output.. and identifying the bin... there is no way to know unless you conduct some specific testing with highly priced equipment...
Anyway whatever 4x304 boards Samsung LED i bought from alibaba they are doing great in my 4x4 tent. Im at day 49 from seeds (i will still veg for few more days) with 3000k only and they look great at 520w 36inch from canopy (you can look pic from my grow I post pretty much everyday).. i consider all my option for next tent but those boards from alibaba seems to be hard to pass on in terms of price and quality.. I dont think ive seen any.. or at least if there its only a few people who got defective unit so it seems so far a very reliable product.. at the price I paid im not complaining at all but time will tell what will be the end result
Schalalala
Active Member
You all should start measure the voltage over one LED, calculate the current and then check with the simulator which voltage bin this is. The voltage bin is just as important as the flux bin...
conversekidz
Well-Known Member
Yup, have 10 on order, along with 10 new tenta safety x2 caps....figure i can burn them up 10 times before I learn my lesson
Big Green Thumb
Well-Known Member
I bought higher wattage thermistors so hopefully they will last a bit longer. Also, my power supplies are not being run near maximum capacity anymore.Yup, have 10 on order, along with 10 new tenta safety x2 caps....figure i can burn them up 10 times before I learn my lesson
Hurricane09
Well-Known Member
Which seller did you go with?Yup, have 10 on order, along with 10 new tenta safety x2 caps....figure i can burn them up 10 times before I learn my lesson
conversekidz
Well-Known Member
Based in China, giorgio11185 has been an eBay member since Aug 07, 2002
giorgio11185 (185455)
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ildiocane
Member
Hello to all, I'm new of this forum, you have a very nice LED side and I'm here to find information.
I bought 660w + power supply of Samsung LM561C S6 4000K that i want to use in a test LED vs HPS clone vs clone in my 2x1 meters room dividing the room in 2 side, one led one hps.
I bought from this Alibaba seller bright-est (is trusted seller a lot of guy I know in other forum use that and buy at the same shop but I think they buy without make questions)
How can I be sure isn't or is LM561C?
My doubt start when I tested this led with a lux meter of my friends and I see the valor is very low for a led have to be 200lm/w and the chinese guy tell me this led is just 119 lm/w for a lot of motivation like power supply, energy etc. and I really don't know if is possyble. This is the mail of the chinese guy:
Yes,i know Samsung said the light effect is 210lm/w,it is just led light effect and this light effect base on very very ideal environment,and different current to run it,the light effect is different.Actually it should be impossible to do in led product application. 210lm/w is one of their sales methods.
I have checked the link,this is our factory other type product, constant current Samsung LM561C rigid led strip,it is especially for the plant growth,more suitable for your application.The light effect is higher than the flexible led strip that you bought due to it is constant current,and the flexible led strip that you bought is constant voltage.
Let me tell you the reason light effect about the constant voltage flexible led strip,
1. As i said above,210lm/w is one of their sales methods.Light effect base on very very ideal environment,and different current,the light effect is different.The light effect of led in the application just have about 85% about it,reduce about 15%.This is a fact.We have test machine integrating sphere to test it.
2. The flexible led strip is constant voltage method,so there are resistor on the pcb,the resistor also have energy consumption.About 1/4 of the total power.So the light effect reduce about 25%.
3. As above,it will have voltage drop due to the flexible led strip is contact voltage,so the light effect reduce about 10%.
These are the main reasons. You can check it with professional person. Also,you can check the light effect with other factory which produce constant voltage 60leds/m LM561C flexible led strip.
I really need some help because I don't want waste my money and use a led can't make my plant grow well.
Thank u so much for help
I upload the led diode and the data sheet the chinese guy sent me.
I bought 660w + power supply of Samsung LM561C S6 4000K that i want to use in a test LED vs HPS clone vs clone in my 2x1 meters room dividing the room in 2 side, one led one hps.
I bought from this Alibaba seller bright-est (is trusted seller a lot of guy I know in other forum use that and buy at the same shop but I think they buy without make questions)
How can I be sure isn't or is LM561C?
My doubt start when I tested this led with a lux meter of my friends and I see the valor is very low for a led have to be 200lm/w and the chinese guy tell me this led is just 119 lm/w for a lot of motivation like power supply, energy etc. and I really don't know if is possyble. This is the mail of the chinese guy:
Yes,i know Samsung said the light effect is 210lm/w,it is just led light effect and this light effect base on very very ideal environment,and different current to run it,the light effect is different.Actually it should be impossible to do in led product application. 210lm/w is one of their sales methods.
I have checked the link,this is our factory other type product, constant current Samsung LM561C rigid led strip,it is especially for the plant growth,more suitable for your application.The light effect is higher than the flexible led strip that you bought due to it is constant current,and the flexible led strip that you bought is constant voltage.
Let me tell you the reason light effect about the constant voltage flexible led strip,
1. As i said above,210lm/w is one of their sales methods.Light effect base on very very ideal environment,and different current,the light effect is different.The light effect of led in the application just have about 85% about it,reduce about 15%.This is a fact.We have test machine integrating sphere to test it.
2. The flexible led strip is constant voltage method,so there are resistor on the pcb,the resistor also have energy consumption.About 1/4 of the total power.So the light effect reduce about 25%.
3. As above,it will have voltage drop due to the flexible led strip is contact voltage,so the light effect reduce about 10%.
These are the main reasons. You can check it with professional person. Also,you can check the light effect with other factory which produce constant voltage 60leds/m LM561C flexible led strip.
I really need some help because I don't want waste my money and use a led can't make my plant grow well.
Thank u so much for help
I upload the led diode and the data sheet the chinese guy sent me.
Attachments
tazztone
Active Member
you shouldn't have bought constant voltage flex strips (= with resistors), because that's the reason why lm/w is lower. you lose efficiency with the resistors, but on the other hand they are cuttable every few LEDs as a result.
they also have constant current ones, and i would be really interested in learning about those. so if you decide to order these, keep the infos coming.
personally i was put off from alibaba sellers by high shipping costs and dubious product claims, so i decided to go with bridgelux strips via digikey
they also have constant current ones, and i would be really interested in learning about those. so if you decide to order these, keep the infos coming.
personally i was put off from alibaba sellers by high shipping costs and dubious product claims, so i decided to go with bridgelux strips via digikey
ildiocane
Member
I'm not expert and the chinese guy advise me that because I need to cut them for make 1x1 meter led lamp, next time I don't buy from alibaba and don't buy constant voltage, I'll do like u, I'll buy from a reputable source and probably also some cob ^^
Viceman666
Well-Known Member
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