Price also is a very big deciding factor for most.
Also those strips don't need any heatsinking @700ma so its just attaching them to a frame
Cobs or QB which has better coverage
- Thread starter whytewidow
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Also those strips don't need any heatsinking @700ma so its just attaching them to a frame
LEDandCoffee
Well-Known Member
You run 3 cobs or qbs? Don't you think you're wasting a lot of light getting so much penetration? Run a 2' f series strip @ 70w and it will throw light deep, but you're wasting light having it so far away.
whytewidow
Well-Known Member
I think all three choices grow amazing herb. Really comes down to a point of preference
LEDandCoffee
Well-Known Member
How far the light can get past the canopy. Green light penetrates the furthest but is the least efficient for instance.
psychedelicdaddi
Well-Known Member
since the diodes dont really become "stronger" when you get closer you can get crazy close to LED strips. like an inch away if your heat is under control. For sure couldnt do that with a COB. Which basically just means more head space in a tent.
Sorry my mistake with saying 24; later on I posted 22 x 2' strips paired with a hlg-320h-c700
Just a frame to hold them all in place, no heatsinking required @700ma.
whytewidow
Well-Known Member
I' mounting some an a sheet of 1/4" alum. You could mount them on anything. But he said at @700ma they didn't even need a heatsink.
whytewidow
Well-Known Member
I was looking at making cobs. Was gonna do 6 or 8 citi cluo48-1818s 3000k 90cri on arctic chiller heatsinks and fans. With reflectors. Was lookn at about 325 shipped. I bet they would flower the shit outta 2x4 tent.
whytewidow
Well-Known Member
whytewidow
Well-Known Member
I like the rapidled cob fixtures too
whytewidow
Well-Known Member
Take the lumens of high output how is 130-150,000 lumens. I think the strips put out like 24xx lumens so it would take quite a few
nc208
Well-Known Member
I prefer the opposite, I prefer 1 big 100w cob vs 100 1w leds (or 0.3w leds which samsung and bridgelux use). While yes you are correct the 100 diodes spread out will be a more even canopy I prefer the more powerful cobs which punch farther down the plant. That being said who is using a single cob to light their space? If you space your cobs correctly at the correct height you can achieve a very even canopy.
wietefras
Well-Known Member
That's a common misconception though.
One big light gets largely absorbed/reflected when it hits the canopy and doesn't travel down much. The leaves are all oriented to this big source of light.
When there are lots of light points, the leaves will orient themselves to the closest ones, but the light points a bit further away can then shine under those leaves.
When you need to hang your lights at 18" to get some uniformity, then your wall losses are huge compared to a led strip fixture where 5" would be enough distance. So better distributed light will give you more light on the plants (less wall losses) and will also give you more light under the plants.
nc208
Well-Known Member
That's why I wrote spaced properly, for example my tent is 40" x 40". I have my lights on a 20" x 20" frame the cobs are spaced apart 15" OC. Very little of that light is being wasted on walls, I found best response for my plants was at a 15" distance at 75w each.
Here is my light, my last run I used strips from Alibaba, which were lm561b+ where I made a light that covered the entire area, It worked great, this time I am using a combo of strips(lm301b 5000k) and cobs and mini cobs to try a few different spectrums. I'd rather use strips for side/supplement lighting but this is just my personal opinion.
that was a month ago, here is today 10 days into flower. Growth is excellent throughout the plant. OG18 hermied so it had to go.
