dabby duck
Well-Known Member
That was a polite way of saying quit being a lazy fuck and look.....mr imsohigh...who cares we all do maybe that would be news on a shopping forum or something derp.
New style Samsung LM561C Board
- Thread starter chuckduck
- Start date
Abiqua
Well-Known Member
wietefras
Well-Known Member
You don't have to link to another site for that. He made the same mistake right here on the forum: https://www.rollitup.org/t/quantum-boards-are-they-worth-it-why-or-why-not.952135/page-2#post-13870259
He saw "S07" marked on his strips and mistakenly assumed it referred to the bin of the lm561Cs. It turned out to be something else since other people had even "S13" on theirs.
Chip Green
Well-Known Member
Randomblame
Well-Known Member
Yepp, it was me who brought him the enlightment, Lol!
A good example of how misinformation spreads on the web, even though it has been cleared up for a long time. No one bothers to correct his old misleading posts, though ... sometimes its just not possible to do it even if you want!
ANC
Well-Known Member
I started measuring the aluminium stock I got, still waiting for a few pieces but decided to run with 3 strips per fixture, as I would save far less than $100 a year. I'd rather get more drivers and tubes and cover all my trays Then I can get some more after I got a few other items I still need.
I still need to get balsa wood for the ends of the fixtures to keep the weight down and hide the wires in.
Also still need to order waterproof 3 pole sockets and plugs to connect to the remote ballasts.
But I can wing that part of the design for now.
I am thinking of having a custom sink made for these guys that can use a diffuser lens film.
It takes quite a bit of precision though as the films need to be at the exact right distance from the LEDs to focus correctly. I was thinking something like a 60 or 90 degree lens as we are using high density anyway.
I've done quite a bit of calculator work and the wide dispersion angle forces one to come pretty close to the light. Not a problem if you have a long bed with many units, as light only gets spilled on the ends.
I'd still prefer a slightly narrower beam than the naked LED, to come up with more practical hanging heights and less spilling over the sides (not in a tent).
I still need to get balsa wood for the ends of the fixtures to keep the weight down and hide the wires in.
Also still need to order waterproof 3 pole sockets and plugs to connect to the remote ballasts.
But I can wing that part of the design for now.
I am thinking of having a custom sink made for these guys that can use a diffuser lens film.
It takes quite a bit of precision though as the films need to be at the exact right distance from the LEDs to focus correctly. I was thinking something like a 60 or 90 degree lens as we are using high density anyway.
I've done quite a bit of calculator work and the wide dispersion angle forces one to come pretty close to the light. Not a problem if you have a long bed with many units, as light only gets spilled on the ends.
I'd still prefer a slightly narrower beam than the naked LED, to come up with more practical hanging heights and less spilling over the sides (not in a tent).
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Randomblame
Well-Known Member
What do you think about small, 3-4inch wide reflector sheets mounted along the lengthsides. LEDgardener has made a video-comparision with qboards with and without qboard-reflector sheets and got Ø 5-10% increased results along the whole area. I would use single-side white coated, 1mm thick aluminum sheet and screw the sheets laterally to the heatsinks.
I will definitely make two reflector sheets for my c-channel build and the units my friend asked for gets builded with two sheets like below!
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ANC
Well-Known Member
I was also thinking of experimenting with some diy reflectors.I saw a youtube vid of a guy par testing a unit with those little wings on. it mainly increased light in the center of the tent.
My ideal unit would have 2 position adjustable reflectors to accommodate whether I am using full or minimum power. My trays are 4x2 and they will be in a row to make 10x4 with probably a bit of hangover on the sides.
At 115 degrees one strip will cover the area of a tray at only 32 cm. I am using 3 strips on a tray
Using a bit of trigonometry to solve the angles, If were to place a reflector to the side of the chips and it was to direct light to the opposite side edge of the tray. The reflector needs to be about 28 degrees off vertical. this is where films start getting cool as some of them can direct light out directionally.
I see ledil makes some LED lenses for LM561c but they come in panels of 11x3 lenses. Anybody have a clue which boards these lenses would fit?
On a side note, I just cut the first length of aluminium channel for my light.
Now I have a template for the other two cuts.
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wietefras
Well-Known Member
I would say he got that gain mostly because the light was way to high up. Even for a quantum board, 24" seems ridiculously high.
The same mistake was made with COBs a few years ago. People compared light intensity for COBs with and without reflectors at the same height. Mixed in with some test setup/measuring errors and the incorrect conclusion was made that reflectors increase light by 20% to 30%. When some proper tests were done it turned out that it was only a few percent in favor for the reflectors if compared at the same height. However the COB fixture with 115 degree beam angle bare COBs could be hung at half the height of the 90 degree beam angle reflector encumbered COBs for the same uniformity. Which resulted in 15% more light with the bare COBs.
When you hang a light that high it makes sense to add a reflector to narrow the beam angle and keep light off the walls. Still, a much better approach is to skip the reflectors and simply hang the light lower.
Although with quantum boards and/or when using a room with very poorly reflective walls, a reflector around the outer edges might always be better. Especially those ledgardner tests show he has incredibly poor reflection off his walls. If anything, all those tests show that white plastic is not a suitable material to use for your walls if you like light on your plants.
Besides, a strip fixture can be put so close to the plants that wall losses are minimal anyway.
Randomblame
Well-Known Member
Yeah, but there are a few differences to COB reflectors but I know what you mean.
The sheets on the sides would only bundle the light of the outer strips. The strips lying further in the middle of the frame will not use the sheets at all. I just want them to slightly amplify the light on the outer sides to get an even better coverage and I think the curved edges can not hurt. My plan would be similar to a multi COB build with reflectors only on the outer COB's while the inner COB's remain reflector less.
BTW,
My walls are already painted with a highly reflective titanium white (a beamer screen color) and the strips will be arranged so that the distances to the outside become smaller. All this has the goal to achieve the most homogeneous coverage without having a hotspot in the middle.
PhenoMenal
Well-Known Member
has anyone bought from Shenzhen Meijiu Lighting Co? they seem to have a lot of quantum board parts and options and with custom options as they're a manufacturer, and they're a Gold Alibaba seller (which i believe means theyve had their premises physically inspected), and 7+ years at Alibaba so they seem legit at least on that front, for whatever that's worth. But I don't know anything else about them. There are obviously a lot of shonky Chinese companies, but at the end of the day most of the world still gets many of our "best" products manufactured there also, so as with everything in life I'd like to treat every individual company on their own merits. Btw in my discussions with them, when i specifically challenged them about genuine Samsung and Bin S6 etc, they confirmed they do use genuine Samsung LM561C S6.
So if you've ever dealt with them in the past i'd appreciate your thoughts on them, positive negative or otherwise, thanks
ps. Massive respect to the team at HLG!!!
It's very admirable how you've not only started the whole "quantum board phenomenon" (you've probably done more to promote Samsung's 561C's than Samsung has lol ), but also been very respectful about people's DIY's which is extra-commendable and embraces the community spirit, and from all reports your Tech Support is excellent too
So if you've ever dealt with them in the past i'd appreciate your thoughts on them, positive negative or otherwise, thanks
ps. Massive respect to the team at HLG!!!
It's very admirable how you've not only started the whole "quantum board phenomenon" (you've probably done more to promote Samsung's 561C's than Samsung has lol ), but also been very respectful about people's DIY's which is extra-commendable and embraces the community spirit, and from all reports your Tech Support is excellent too
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I haven't seen any reviews yet but one guy over on grasscity did buy some n yet to report. On a side note there's a guy over on overgrow who is actively selling these https://solstrip.com/en/solstrips/12-132-solstrip-x1-400.htmlhas anyone bought from Shenzhen Meijiu Lighting Co? they seem to have a lot of quantum board parts and options and with custom options as they're a manufacturer, and they're a Gold Alibaba seller (which i believe means theyve had their premises physically inspected), and 7+ years at Alibaba so they seem legit at least on that front, for whatever that's worth. But I don't know anything else about them. There are obviously a lot of shonky Chinese companies, but at the end of the day most of the world still gets many of our "best" products manufactured there also, so as with everything in life I'd like to treat every individual company on their own merits. Btw in my discussions with them, when i specifically challenged them about genuine Samsung and Bin S6 etc, they confirmed they do use genuine Samsung LM561C S6.
So if you've ever dealt with them in the past i'd appreciate your thoughts on them, positive negative or otherwise, thanks
ps. Massive respect to the team at HLG!!!
And are really just this https://m.alibaba.com/product/60728490522/30x400mm-samsung-LM561C-s6-sun-board.html?spm=a2706.7843299.1998817009.157.gWSpMk
The guys over there really seem to love them and at 20$ a strip with a 3x mark up i hope so. Yet that company only has a 2 year rating. So I believe that the company you suggested would be even better to deal with.
nc208
Well-Known Member
I bought those strips from that Alibaba seller. There' a reason his strips are 1/3 the price and that's cuz you get lm561b+ instead of lm561c.
BuddyColas
Well-Known Member
So about 10% less efficiency for 1/3rd the price of the real deal?
Victor6634
Well-Known Member
You got to remember it’s too good to be true it probably is , also you get what you pay for.
Just my 2cents
Just my 2cents
nc208
Well-Known Member
Sure if you like ordering one thing and settling with whatever they decide to give you.
PhenoMenal
Well-Known Member
I have a flatbed scanner so when mine arrive from Shenzhen Meijiu i'll give them a scan and post here. I contacted another rollitup member who has already dealt with them and said they seem like legit 561C S6's to him and he seems happy enough with it. Freight wasnt cheap so im assuming they'll be here in about 7 days lol. Anyway fingers crossed!
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Do you have a efficiency chart for the LM561b by chance i heard they were a lot closer than 10% exp at lower watts