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- #21
Might As Well Take My Own Advice
- Thread starter 36growingnoob
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Nice and level...everybody happy!
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- #23
36growingnoob
Well-Known Member
Well we are now 8 days since going 12/12. Still dont have any meters. I checked the ph with the solution and looks to be around 5.6 5.7. Yesterday I was able to rework some of the lights that were not working.
The plant is obviously stretching outward and up.
My wife is back to work and we have got our daily bills caught up. I will being to Stl. This weekend hopefully I can find a good shop there and pick up what I need.
I need hydro nutes, ph meter and ecc meter.
I also look forward to stopping in to check on an old war buddy.
Looks to be a good weekend.
Now lets look at some pictures:
The plant is obviously stretching outward and up.
My wife is back to work and we have got our daily bills caught up. I will being to Stl. This weekend hopefully I can find a good shop there and pick up what I need.
I need hydro nutes, ph meter and ecc meter.
I also look forward to stopping in to check on an old war buddy.
Looks to be a good weekend.
Now lets look at some pictures:
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Amazon doesn't deliver to your neck of the woods or do you prefer to patronize local businesses? I get everything from the internet except my ProMix HP!
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36growingnoob
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It does Shed but my wife gets paid Thursday night and we are going on Saturday. If I go after the Zoo then I know for sure what budget is. If I dont get it in the budget Saturday I will for sure on the first when I get paid. If I have to wait I'll get it online.
Oh gotcha! I'm sure the locals will appreciate the business 
.
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- #27
36growingnoob
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After taking the pictures I saw the light reflections on the wall and noticed the cone shaped reflection or profile on the wall. Woooooo they are all the same length. Hmmmmmmm. Yulp i downloaded the lux meter and at the height of the light at pictures the lux was 18000. I then lowered the lights to get a lux reading of 38000. With sunny day being 30000 according to the app. Ill grab some pictures and see if the light profile on the wall is different.
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- #28
36growingnoob
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Last I checked, sunny days where I am (back in March) come in at 138,300 lux!
Emilya Green
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Thats cool! I need to take my meter outside and measure my sun!Last I checked, sunny days where I am (back in March) come in at 138,000 lux!
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- #31
36growingnoob
Well-Known Member
Start by cleaning the front camera lens on the phone, and then see if there's a calibration setting for the app. Not sure what you calibrate against though!
App lux meters are hit and miss, and even good ones aren't as accurate as a handheld.
App lux meters are hit and miss, and even good ones aren't as accurate as a handheld.
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36growingnoob
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36growingnoob
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36growingnoob
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Ok lights best reading i can get is 96k that is about 8 inches from canopy. Leave it there or raise it back up to 12 where it was 38000
Emilya Green
Well-Known Member
Please correct me if I am in error, especially since I am new to the LED world and am forced to rely on my knowledge from the HID world, but isn't anything over 75k-80K too much light for our indoor plants? And especially speaking of LED light, how much is too much?
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- #37
36growingnoob
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I agree Shed. At least it is a reference to try to keep the lights at.
I dunno but I am on a mission to answer that. Off to do some looking around. I will post what I find.
That's what I had read. For what it's worth, I got this link from farside's journal:
How to Use a Lux Meter to Increase Cannabis Yields - RQS Blog
Among pH testers, loupes, and refractometers, lux meters are a useful tool cannabis growers can harness to ensure optimal plant productivity and health.
www.royalqueenseeds.com
Where they say:
"Maximum recommended amount of light: 75,000 lux
What about even more light? At some point, increasing the light beyond a threshold plant can manage will actually diminish returns. Said differently, once you reach about 85,000 lux, it’s simply too much. Some strains may already show signs of light stress at only 75,000 lux, with the risk of light bleaching increasing at over 80,000 lux. To keep it safe, it is best to stay at or below 75,000 lux."
Emilya Green
Well-Known Member
and I am betting that LED light can be even more powerful still. Measurements depend on the light color, and a full spectrum CRI 90 light is going to read higher than a blurple with the same wattage.... but this is the problem. What is the actual PAR? I think that someday we may be able to come up with a formula to convert ppfd/lux and par, based on CRI... but right now each of us has to determine where our lights are in relation to this max light thing. I can produce about 86K of measured light under my new CRI 90 array, but I am betting that this is way too much light. In the HID world I was happy to have 65K at the canopy, but I still don't know how much of THIS tuned light I am going to want. Those of us who can, need to document our results for our various lights, because I am certain that the proper usage of a COB is not going to be the same as a QB or a Samsung... and we are all going to be different than MH/HPS standards.
From the conversion charts and calculators on the web, if you have a single temp light you can convert lux to PPFD. The multi-spectrum ones don't seem to be able to do that.
For my 3000K Samsung strips I use this calc:
For my 3000K Samsung strips I use this calc:
Converting Lux to PPFD & Measuring Lux with Smartphone
Spectrometer and Quantum Sensor can cost hundreds to thousands of dollars and not every grower can afford them. A Lux meter app on phone can be used to ensure even light spread across canopy and give estimate of Lux. Use a calibrated Lux meter for better accuracy. Just divide the Lux value you...
horticulturelightinggroup.com
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