Dmannn
Well-Known Member
So healthy looking!
Next on stage... ... ... Rita Fang and the Alibaba QBs!
- Thread starter ChiefRunningPhist
- Start date
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- Tags
- alibaba boards lm561c qb304 samsung
Prawn Connery
Well-Known Member
I don't blame him - all these technical threads get hammered and the poor old grow-related threads get ignored and die in the LED section, lol!
aabra.420
Well-Known Member
not hijacking . just here for some help
was looking for active qbs and cobs thread.
found this 1 so i posted. .
ChiefRunningPhist
Well-Known Member
Ya lil dry looks like, if anything, actually looks pretty good ha
Moflow
Well-Known Member
Maybe it was @OLD MOTHER SATIVA ?
Moflow
Well-Known Member
Fake weed...?
Rocket Soul
Well-Known Member
Cobby did some tests on qbs, cobs and OMS china boards. He has a small spheretester which works on cobs. But on the boards he used his tent, and i think the difference in form factor of boards made it hard to get anything from the results. If my memory serves me.
coreywebster
Well-Known Member
I think your right!
coreywebster
Well-Known Member
You were paying better attention than I (as always)
Moflow
Well-Known Member
Courtesy of @wietefras from another thread.
I took some macro photo's of the LM561C's on my G-series Gen 3 Samsung strips from Digikey.
3000k
5000k
Very good images.
I took some macro photo's of the LM561C's on my G-series Gen 3 Samsung strips from Digikey.
3000k
5000k
Very good images.
Attachments
Prawn Connery
Well-Known Member
From 7.57 - LM561C die is bigger than LM561B+ - I take back what I said.
Prawn Connery
Well-Known Member
You were right and I was wrong
Rocket Soul
Well-Known Member
Theres a thread going on for about 80 pages like this, are they s5 are they s6? The only way of knowing is spheretest seems to be the general conclusion. So i say sphere test the f*ck out of those boards if you feel it will help. But what are you comparing to? And all this bin stuff is tolerances and margins of percent. That can get amplified by imprecision in measuring equiment. Basicly i think its very hard from a spheretest-result to argue and prove anything definite. And you will be out of cash.
Personally im not even sure if it matters that much, mostly if your driving them hard. S5,S6, i think you get more benefit from driving any diode really soft, rather than paying more for a top diode and drive it hard.
The way it works out for me where im at:
I can get 2x288V2 hlgs for about 300€=
576 diodes, brandspanking top bin, runs about 250w normally but can technicly go to around 300w.
I can get 3xFoTop lm561C sX bin, but reasonably not less than s5. 2400 of good, not best, samsung diodes for just over 300€
If i run the hlg kit at full ill get about 300 watts, but id have to do something to cool it a bit extra.
The Fotops: if i where to run them on the same 300w itd be 100 per board, or .125 w per diode instead of .6w. Or about a 5th of max.
Even if i wanted to run nominal, or a third of max, id get about 480w out of the 3 fotop boards. And as per
https://www.samsung.com/led/support/tools/led-component-calculator/
... Id still beat the efficiency of a super topbin at around 185lums/w using the fotops and i would get +50% more power. Win-win.
Most of you guys are stateside so the calculation might be a bit different for you, might make more sense to go with the best, allways. But i feel that even if the numbers may be close, and with all the uncertainties of buying from china;
4x as many diodes, spread out over 7.5x more board area, maybe and fairly probably a bin lower, its still the better option as i can run it sodt without heatsinks and get it low down onto the cannopy so i dont lose lights.
Edit: also for Rita being strange... Im pretty sure your not the first one to bring this up with her. I did, and got similar pushback. Im pretty sure has a few dozens a day. And in the end the only way to say is by you making a spheretest. If the 80 page thread mentioned above is any indication of what she has do deal with im not surprised if she think we are timewasting dumbos that she has no time for unless we do what we all know is the only way to move such issue forward: spheretest, (or it didnt happen).
I wouldnt be surprised either if youd feel annoyed if litterally every client that contact you question the quality of your product because you are chinese. To me her reaction is not great, but i definitely think it makes sense, especially if she bought the diodes as s6.
Personally im not even sure if it matters that much, mostly if your driving them hard. S5,S6, i think you get more benefit from driving any diode really soft, rather than paying more for a top diode and drive it hard.
The way it works out for me where im at:
I can get 2x288V2 hlgs for about 300€=
576 diodes, brandspanking top bin, runs about 250w normally but can technicly go to around 300w.
I can get 3xFoTop lm561C sX bin, but reasonably not less than s5. 2400 of good, not best, samsung diodes for just over 300€
If i run the hlg kit at full ill get about 300 watts, but id have to do something to cool it a bit extra.
The Fotops: if i where to run them on the same 300w itd be 100 per board, or .125 w per diode instead of .6w. Or about a 5th of max.
Even if i wanted to run nominal, or a third of max, id get about 480w out of the 3 fotop boards. And as per
https://www.samsung.com/led/support/tools/led-component-calculator/
... Id still beat the efficiency of a super topbin at around 185lums/w using the fotops and i would get +50% more power. Win-win.
Most of you guys are stateside so the calculation might be a bit different for you, might make more sense to go with the best, allways. But i feel that even if the numbers may be close, and with all the uncertainties of buying from china;
4x as many diodes, spread out over 7.5x more board area, maybe and fairly probably a bin lower, its still the better option as i can run it sodt without heatsinks and get it low down onto the cannopy so i dont lose lights.
Edit: also for Rita being strange... Im pretty sure your not the first one to bring this up with her. I did, and got similar pushback. Im pretty sure has a few dozens a day. And in the end the only way to say is by you making a spheretest. If the 80 page thread mentioned above is any indication of what she has do deal with im not surprised if she think we are timewasting dumbos that she has no time for unless we do what we all know is the only way to move such issue forward: spheretest, (or it didnt happen).
I wouldnt be surprised either if youd feel annoyed if litterally every client that contact you question the quality of your product because you are chinese. To me her reaction is not great, but i definitely think it makes sense, especially if she bought the diodes as s6.
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Rocket Soul
Well-Known Member
All true, except maybe for the spread. Fotop spreads 800 diodes on aprox 3x1 foot board. Not sure of the dimensions of those strips but im guessing more diodes/square inch of board. Not that it matter that much as both would be able to be brought down around 4-6 inches from the cannopy with even cover.
But i like those fotops for simple; you just hang it, no frame or heatsink, connect, and its done.
whytewidow
Well-Known Member
Rita sells boards labeled lm561c s6 and they are not s6 voltage bins. Theres a guy on the DIY fb page on ritas page. Had his restored in a sphere. Apparently he has a good buddy that works for a place that has one. But they were definitely not 561c s6 diodes. Just like my strips I just got. Labeled lm301b and they are clearly SMD5630s junk. THESE CAME FROM RITA SOLD AS LM301B DIODES.
The fuckn package even says SMD5630
And 40 lm301b diodes would hold more than an amp.
The fuckn package even says SMD5630
And 40 lm301b diodes would hold more than an amp.
