nevergoodenuf
Well-Known Member
And Alex, they are really loving these lights!!! 4 of your COBs covering a 5'x8' area
DUET 2400 (LED FIXTURE) - UP TO 2400 WATTS (Flip Chip Opto)
- Thread starter URSA LED
- Start date
SaltyNuts
Well-Known Member
Now that all this has been said, what do you think of a theoretical greenhouse supplemental lighting that is mono blue for vegging and mono red for flowering? Let the ambient sunlight take care of the rest... would enough green and amber be getting to the plants on an average overcast day, in the greenhouse? I know it would probably be more effective to have a 4000K for vegging with a supplemental red, but please humor me!BTW ...I'm not quite sure if this the appropriate thread to post this ,but what the heck ...
I'm gonna do it ...
Maybe it will be a bit of help for the FCO team ....
I've multiplied the McCree curve ( aka "Photosynthesis Action Spectrum ) with the Absorptance curve of Cannabis Sativa
species ....
The result is ... a mixture of absorptance & RQE per nanometer ...
A combined curve that shows the overall photosynthetic potential (! ) per nanometer ...
View attachment 3586772
The highest " photosynthetic potentional " ( PP ) ,at the range of 400-700 nm ,
is located at 625 nm ( PP=0.893 ) .
The lowest points :
1 ) At 530 nm (PP=0.592 )
2 ) At 400 nm (PP=0.590 )
3 ) From 688 nm to 700 nm ( PP= 0.586 to PP= 0.31 ,respectively )
PP >= 0.8 have the photons of the range 582 nm up to 679 nm ( deep yellow to deep red )
Cheers.
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Herbal_Essence
Well-Known Member
speechless...
Airwalker16
Well-Known Member
It's A lot easier than using a holder!
nevergoodenuf
Well-Known Member
@Herbal_Essence- are you worried about only 2 screws holding it in? Don't, the COB is built on an 1/8" thick aluminum square, so it won't taco as you screw the 2 down. These COB feel unbreakable compare to all other COBs I have worked with. They aren't planning on holders, but you can get screw in posts if you special order the COBs.
nevergoodenuf
Well-Known Member
This is a size comparison between the Luna 300 and the Citizen CLU056.
SaltyNuts
Well-Known Member
so you're running the Luna300 at about 250W right?
nevergoodenuf
Well-Known Member
I am running them at 120 w, 250w, and I have run them 320w. 250w is where I like so far.
Airwalker16
Well-Known Member
So for 250, you need meanwell HLG240's for each one? What amperage? What's their forward voltage?
nevergoodenuf
Well-Known Member
HLG240h-48b or the HBG240h-48b. Same driver different case. 5 amps. 46v.
Airwalker16
Well-Known Member
Ah. So there's no reason to use a Constant Current driver with just 1 cob really huh?
nevergoodenuf
Well-Known Member
I was told by Flip Chips engineers that because of the way the wire there COBs that you can run them in parallel without any problems. And to your question, no.
You keep forgetting that that driver is a Constant Current driver, it just has a voltage limit. As long as you are under that limit it runs Constant Current @ 5 amps.
You keep forgetting that that driver is a Constant Current driver, it just has a voltage limit. As long as you are under that limit it runs Constant Current @ 5 amps.
nevergoodenuf
Well-Known Member
I found that in the back pages of youtube.
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Airwalker16
Well-Known Member
I still have no clue how by they work compared to the C version
Bill Lidgate
Active Member
IMHO trying to duplicate SOL (point source LED COB at 500-2400W) is just silly as you run into similar heating issues 
with uneven light distribution.
Its much better to distribute your LEDs over the entire grow area; everything is better with a multitude of light sources.
with uneven light distribution.Its much better to distribute your LEDs over the entire grow area; everything is better with a multitude of light sources.