Humple
Well-Known Member
There are plenty of growers finding 4 QB288s to be more than a match for SE HPS.
https://www.rollitup.org/t/from-des-to-leds.948046/
Just one example.
DIY with Quantum Boards
- Thread starter robincnn
- Start date
https://www.rollitup.org/t/from-des-to-leds.948046/
Just one example.
Kushash
Well-Known Member
If you don't get the help you need here I would suggest posting a new thread in the plant problem section.
Toohighmf
Well-Known Member
Like I said I was doing 3-2-1 but started seeing defics. So I upped things. I don’t measure what I add. I do it by EC.
booms111
Well-Known Member
What pen are you using for EC/ppm? Reason I ask is you previously posted 1.4ec was 1000ppm but to me 1000ppm is 2.0 EC.
Also what's the genetics your running that have the issues in your pics? I've seen a lot of chemdawg crosses with that yellow leaf splotchy thing going on on them over the years.
Oh I see I must have missed that post I never use those meters after having one break I can't trust it. I'm surprised you saw deficiency I ran jacks with 4 strains on 4 different runs never had an issue. I switched to megacrop with some different strains this run plants look happier but that could be strain dependent
pop22
Well-Known Member
If HPS works so great, why are you building a COB light????? Explain why COBs would give you better coverage?
Viceman666
Well-Known Member
Whats your ph at? Could be some lockout of some nuts so adding or reducing wouldnt change much if ph is not on point..
Toohighmf
Well-Known Member
I’m using a nutridip grow boss at .5 conversion. (That’s probably the discrepancy) Strains are deathstar x Cherry pie, Banana OG, and GG4. PH is 5.8-6.0.
ganjamystic
Well-Known Member
did you see his original post? the answers to both of your questions are right there..
How has this claim not already been debunked? Maybe people are comparing against a degraded HPS bulb or something, I'm not sure. The data I have is from a fresh 1k HPS bulb.
4'x4' Reflective Space
HPS: 892.79 µmoles/m2/s
HLG: 625.00 µmoles/m2/s
I'm without a doubt a proponent for LED, so this isn't 'HPS guy bias'...The HLG-550 doesn't really shine in the light uniformity category either, and even looks marginally outperformed by 1000w HPS in the above data. So definitely less light, and no meaningful difference in uniformity. What makes the HLG-550 a viable replacement for 1000w HPS?
I considered buying quantum boards for my space, but after collecting this data I went with building my own COB arrays. I built 10 fixtures, so the price was near HLG-550 even after applying the 20% coupon code they're currently offering. If you only wanted 1 or 2, COB would be a much pricier option.
I believe light uniformity is more important than it gets credit for. People are always focused solely on the light output. I think with better uniformity, your plants will benefit from higher PPFD due to the absence of PAR spikes.
Its why I decided to design my own fixture. Now that its been assembled and tested, I feel very confident with my lighting system. Nearly 100 more µmoles/m2/s, and much nicer light uniformity. Also note a higher PPFD was achieved even with the absence of PAR spikes. For comparison, the highest point my fixture reached was 1141 µmoles/m2/s while HPS' was 1427.
750w COB Array - 4'x4' Space
frigginwizard
Well-Known Member
not really, all he says is that he likes this custom cob array more than an HLG 550. A custom QB or samsung strip build would have done the same thing for around the same price with less watts.
booms111
Well-Known Member
I use the .5/500 scale also, 500ppm is 1.0ec. You must be based on the .7/700 scale for your numbers to work since 1.4ec on the .7 scale is about 1000ppm.
Possibly your running wrong amount of nutrients causing lockout of certain nutes or creating deficiencies because of the confusion of thinking your based on .5 scale when really your probe is based off .7 scale going off you saying 1.4ec = 1000ppm.
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CCCmints
Well-Known Member
Because my COB arrays outperform HPS on all fronts. You can see that in the data I've posted (which you seem to believe is fabricated, but you probably won't conduct any tests yourself to find out if that's true).
14 more powerful light sources, in an optimal configuration, laid out over a 42"x42" frame VS. strips of smaller, weaker diodes in a 26”x20” frame. If you’re trying to cover a 4’x4’ canopy, how could you expect a fixture nearly half the size of your target footprint, with weaker diodes, to evenly spread its light output across the entire 4’x4’ space?
Quantum boards simply do not have the power required to succeed 1000w HPS. Which is understandable, since their power draw is half that of 1000w HPS. Even in a 1’x1’ space, the HLG-550 has lower PPFD than 1000w HPS over a 4’x4’ space.
Problem with HPS is the massive PAR spikes in its output. You can’t place your HPS as low as you could a quantum board because its highest point is 1427µmoles/m2/s while its PPFD is only 892.79µmoles/m2/s. With my COB fixtures, higher PPFD was achieved without massive PAR spikes skewing the data.
Highest point: 1188 µmoles/m2/s
PPFD: 970.41 µmoles/m2/s
frigginwizard
Well-Known Member
You keep using the term "quantum board" interchangeably with the HLG550, that would be like us using the term COB and PLC-6 interchangeably.
An HLG550 is 4 quantum boards at 2100ma, but you can use any number of quantum boards in any configuration to achieve the spread you desire. Just like a PLC-6 is made of 6 COBs in a small fixture, but your cob build is more COBs spread further apart.
Johnnycannaseed1
Well-Known Member
I have tested HLG 300 which is 280w in a 4 x 4 tent against a cheapy 600w (680ish watts actual draw).How has this claim not already been debunked? Maybe people are comparing against a degraded HPS bulb or something, I'm not sure. The data I have is from a fresh 1k HPS bulb.
4'x4' Reflective Space
HPS: 892.79 µmoles/m2/s
HLG: 625.00 µmoles/m2/s
I'm without a doubt a proponent for LED, so this isn't 'HPS guy bias'...The HLG-550 doesn't really shine in the light uniformity category either, and even looks marginally outperformed by 1000w HPS in the above data. So definitely less light, and no meaningful difference in uniformity. What makes the HLG-550 a viable replacement for 1000w HPS?
I considered buying quantum boards for my space, but after collecting this data I went with building my own COB arrays. I built 10 fixtures, so the price was near HLG-550 even after applying the 20% coupon code they're currently offering. If you only wanted 1 or 2, COB would be a much pricier option.
I believe light uniformity is more important than it gets credit for. People are always focused solely on the light output. I think with better uniformity, your plants will benefit from higher PPFD due to the absence of PAR spikes.
Its why I decided to design my own fixture. Now that its been assembled and tested, I feel very confident with my lighting system. Nearly 100 more µmoles/m2/s, and much nicer light uniformity. Also note a higher PPFD was achieved even with the absence of PAR spikes. For comparison, the highest point my fixture reached was 1141 µmoles/m2/s while HPS' was 1427.
750w COB Array - 4'x4' Space
I mapped both lights using 16 data points and I found the optimal height for HLG 300 is 18" in 4 x 4.
But here is the kicker 280w of QB power produced 72.3% of the light output of 680ish watts of HID's.
This means it costs the HID 400watts more in power just to produce 27.7% more light.
Based on those figures alone, I can easily surmise that an HLG 550 is going to keep up with a 1000watt single ended HID lamp.
With regards to uniformity, I have not worked it out yet, but you can do so by calculating the variance,
But just by eyeballing HLG 300 dataset vs HID dataset I can see there is a wider variance in the HID dataset, meaning it is less uniform.
Even by the design of HLG lamp... i.e multiple points of light emitting from a larger area vs an HID lamp... i.e one point source of light emitted from a small area, it is blatantly obvious which lamp is going to be better when it comes to uniformity. So I completely fail to understand how you have arrived at the conclusion that the HID is better uniformity wise?
I have got an HLG 550 on order and I am going to plot it out then I will know for sure what is what, but common sense, design, and maths dictate that it is likely going to be as good if not better than a 1000w SE, which seriously makes me wonder about your graphs and figures!
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Humple
Well-Known Member
Care to point out from where on their site you gleaned this data? I'm not seeing anything like the graph you posted.
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Johnnycannaseed1
Well-Known Member
Don't believe him, his figures are waaaaay off.
Besides the proof is in the pudding when it comes to quantum boards, plenty of threads with killer results, enuff said!
booms111
Well-Known Member
Based on your findings wouldn't a HLG 550 need about 20% more light to compare to a single end 1k hps or possibly surpass it when it comes to light output. I personally don't care about efficiency or watts used, I care about end results in my product. So with that said I'd guess HLG should produce a 750watt fixture with maybe 6 boards to really be equal to a 1k hps?
Johnnycannaseed1
Well-Known Member
You cannot go by figures alone and hope to scale it up, lighting is fickle and does not work like that.
Fixture design, and the optimal hanging height of each fixture in a given area are factors that are going to come into play.
Having said that I think you will find your maths are out because I have it that 350ish watts should be the equivalent of a 680 watts of HID that puts it around the 50% mark, which makes it in theory at least, that HLG 550 is going to keep up with, or possibly outperform 1000 watt SE.
I will do the test when my HLG 550 arrives and I will post the results here, but for now, I am calling BS on those graphs based on what I have seen/tested so far!
Fixture design, and the optimal hanging height of each fixture in a given area are factors that are going to come into play.
Having said that I think you will find your maths are out because I have it that 350ish watts should be the equivalent of a 680 watts of HID that puts it around the 50% mark, which makes it in theory at least, that HLG 550 is going to keep up with, or possibly outperform 1000 watt SE.
I will do the test when my HLG 550 arrives and I will post the results here, but for now, I am calling BS on those graphs based on what I have seen/tested so far!