Building a Home Made LED
- Thread starter tenthirty
- Start date
When I first got my Lumigrow ES-330, I experimented a bit trying to find the effects of varying levels of r/b. It is easily done with the Lumi, because each color has independent power adjustments. Excessive amount of blue can create a plant with so little stretch that it is impossible to LST or scrog the damn things. If I remember correctly, both KNNA and OldMac advised me that only about 10% blue was needed. My experiments with the Lumi would tend to validate that.
tenthirty
Member
Well, the next run will have one fixture of NW and WW and the existing fixture of NW and 660.
So I will be turning off the 660nm leds for the first 2 weeks and see what we get.
At 14 days, there is nothing I can do about the current run.
By having the grow split into 30 or less day chunks, it sure makes the turnaround considerably quicker per experiment.
I will be getting the use of a quantum meter, and there will be some measurements from the new fixture.
So I will be turning off the 660nm leds for the first 2 weeks and see what we get.
At 14 days, there is nothing I can do about the current run.
By having the grow split into 30 or less day chunks, it sure makes the turnaround considerably quicker per experiment.
I will be getting the use of a quantum meter, and there will be some measurements from the new fixture.
sweet can't wait tenthirty
There is an interesting story in LED Magazine this month...again........called
"Understanding color science to maximize success with LEDs - part 3.
You have to be a member to either download the pdf or be able to view it online... There's a ton of useful info there so not really a big deal to 'subscribe' to the site.....it is free after all..
http://ledsmagazine.com/
"Understanding color science to maximize success with LEDs - part 3.
You have to be a member to either download the pdf or be able to view it online... There's a ton of useful info there so not really a big deal to 'subscribe' to the site.....it is free after all..
http://ledsmagazine.com/
hmm.. I haven't tried copying anything and I have acrobat pro..if that will not work.. then try an image sizing addon for the browser and then screen capture it.. I mean when reading it in the 'ezine' format on line...
Just talking out the side of my mouth there,,,not sure if it will work but the theory sounds.....well sounds sound!! ROFL>>>
Good Luck
tenthirty
Member
Here is the key.
http://en.wikipedia.org/wiki/Planckian_locus
What this does is give us a qualitative starting point.
The Planckian locus gives us a spatial representation for the calculated color quality curve for a (standard) black body/star.
http://en.wikipedia.org/wiki/Black_body
The above with this,
gives us a datum, kinda like 29.92in mercury is sea level on a standard day.
Compare the Planckian locus chart against what is coming out of your led, against sun light, HPS.
What is the curve the plant wants to see?......and why........
Best way to create it? CCD and a computer???? (big bucks!!!)
I'm opting for the pocket calc. in my head.
Isn't that what the article is about.
http://en.wikipedia.org/wiki/Planckian_locus
What this does is give us a qualitative starting point.
The Planckian locus gives us a spatial representation for the calculated color quality curve for a (standard) black body/star.
http://en.wikipedia.org/wiki/Black_body
The above with this,
gives us a datum, kinda like 29.92in mercury is sea level on a standard day.
Compare the Planckian locus chart against what is coming out of your led, against sun light, HPS.
What is the curve the plant wants to see?......and why........
Best way to create it? CCD and a computer???? (big bucks!!!)
I'm opting for the pocket calc. in my head.
Isn't that what the article is about.
analogue
Member
I think they'll be ok up to 650 maybe 700nm now.
Apogee's quantum meters mention a range of 400-700, with some discussion about spectral sensitivity above 650nm.
There are also models with options for selecting Outdoor or Indoor light.
Li-Cor talks about 400-700nm.
A question I have about quantum meters has to do with the ones with options for sunlight and indoor light. Would we be wanting to use the outdoor light setting?
Unless there has been some pretty recent changes (since February), the Li-Cor is the only one that really is suitable for usage with LEDs. I looked at both of those, and the Spectrum Technologies Lightscout, and was told that the two handheld units would not give accurate readings for LEDs because the sensor response wasn't specific enough to read single wavelengths well. The added problem was that the wavelength that I was most interested in measuring (660 nm) was right about where the response fell off the cliff. The Li-Cor unit is damn expensive with the data logger. I started pursuing hooking it up to one of my DVMs or o'scope, and about that point exceeded my attention span.
This technology does change pretty quickly, and I'd be interested to know if there is a reasonably economical answer. It would sure facilitate playing with these things.
Integrated Compact Optical Vortex Beam Emitters
http://www.photonics.com/Article.aspx?AID=52139
a video can be found here
http://phys.org/news/2012-10-optical-vortices-chip.html
mixing white leds, StoneAge
Osram Oslon: LCW CQDP.CC
take a look at the spd-chart
http://catalog.osram-os.com/catalog...Oid=00000003000309d8030d0023&act=showBookmark
tenthirty
Member
Go vuk, go!!
Considering I really like to make hash.
http://forum.grasscity.com/indoor-m...imum-resin-production-medical-cultivator.html
Comments???
Ya know, I can do a quick (2 month) testy on this.
Considering I really like to make hash.
http://forum.grasscity.com/indoor-m...imum-resin-production-medical-cultivator.html
Comments???
Ya know, I can do a quick (2 month) testy on this.
!!!!!!!!!!!!!!!DAMN!!!!!!!!!!..never heard it called 'Hash Tips' before though.. I always thought that was bleaching but do you see all those trichomes!?!?!? Now that's what I'm talking about!! BOOOOYAAAAA!!!!!!!!!...heheh
Nice find brother...very nice and yes, I do believe someone should do a test on that to see if there is any truth to it.
I'm still of the school of the 660nm. I mean if everyone and their brother is saying that the peak uptake is at or around the 660-670nm wave length, it would only make sense to me that I would listen to these people with all those letters behind their names. (ei..Dr so & so of 6 degrees...etc.etc..) and put the damn 660nm LED's into the fray...all be damned!
Just my two bits........
'
I'm beginning to think whether 660 is +/- is strain dependent. Put them on a separate switchable circuit and you are covered
