skoomd
Well-Known Member
With 15 strips in a 2x4, you'll probably hit 1000PPFD with 350-370w.
Just pulled the trigger....
- Thread starter nfhiggs
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- f-series lm561c samsung strips
hybridway2
Amare Shill
Light density would be my reason.
whytewidow
Well-Known Member
Not sure what I'm at now. Don't have a meter to check. I need to invest in one.
Randomblame
Well-Known Member
Really..?
Two SR strips next to another puts out the exact same amount of photons as a DR strip, do you really think it matters if you take them 2 inch apart? ...In a closed enviroment?
Less but therefor DR strips means only you have more space between the strips and you would need more distance between the light and your plants to get the desired homogenity. But the number of photons hitting the plant would be the same when measured at the same height.
10 SR strips 4" apart you get homogenity at ~4" distance, with 5 DR strips 8" apart you need ~twice the distance for homogenous measurings. But if you measured at lets say 16"(a usually used distance) both lights would produce the same PAR readings. It shifts only the point where the light is mixed when you use less but more powerful strips.
Aolelon
Well-Known Member
The 4' strips are on sale too.. 12.37$ for the 3500k.
https://www.arrow.com/en/products/bxeb-l1120z-35e4000-c-b3/bridgelux
https://www.arrow.com/en/products/bxeb-l1120z-35e4000-c-b3/bridgelux
hybridway2
Amare Shill
When I bought mine I asked for closer spacing fir density. For me that equals maintaining light in depth.
Yodaweed
Well-Known Member
Trying to say this in a nice mannor but that is a very scraggly bud, please take no offense but if my setup produced scrawny buds like that i'd be extremely disappointed.
Randomblame
Well-Known Member
Nope, would be the same with two strips vs. one DR strip.
They both would produce same number of photones and when measured in the same height it would be the same. The only point where you get higher reading from DR strips is when you go 2" close to the light but in the same time there is much less light between two strips because it's too close for proper overlapping.
From the point where the light comes homogenous the intensity readings would be the same.
Two lights with HLG-240's, one with 10 SR the other with 5 DR strips would give you the same amount of light. The only difference with 10 strips would be a better homogenity when properly distributed. So less hotspot in the center but more bang on sides and corners. But average readings from both lights would be the same.
What's better, when a few leaves getting intense light and the rest sits in the shadow or when all leaves getting indeed the same amount of photones, but with less intensity?
Remember, photosyntesis gets more efficient with less intensity.
I've used COB's for a long time(8 CXB's above a 2x 4') and now use 20 2ft. SR-strips and it's obviously that the light reaches deeper into the canopy.
Almost no shadows because of 1440 light sources and multiple overlapping. 50-55klx above the whole canopy, no center hotspot and +85% intesity in the corners means no larf down to the bottom. It's mid of week 7 and I'm pretty sure this time only sugar leaves will find their way into my trim box.
They both would produce same number of photones and when measured in the same height it would be the same. The only point where you get higher reading from DR strips is when you go 2" close to the light but in the same time there is much less light between two strips because it's too close for proper overlapping.
From the point where the light comes homogenous the intensity readings would be the same.
Two lights with HLG-240's, one with 10 SR the other with 5 DR strips would give you the same amount of light. The only difference with 10 strips would be a better homogenity when properly distributed. So less hotspot in the center but more bang on sides and corners. But average readings from both lights would be the same.
What's better, when a few leaves getting intense light and the rest sits in the shadow or when all leaves getting indeed the same amount of photones, but with less intensity?
Remember, photosyntesis gets more efficient with less intensity.
I've used COB's for a long time(8 CXB's above a 2x 4') and now use 20 2ft. SR-strips and it's obviously that the light reaches deeper into the canopy.
Almost no shadows because of 1440 light sources and multiple overlapping. 50-55klx above the whole canopy, no center hotspot and +85% intesity in the corners means no larf down to the bottom. It's mid of week 7 and I'm pretty sure this time only sugar leaves will find their way into my trim box.
skoomd
Well-Known Member
Damn, hell of a light! 20 single rows in a 2x4 is noiceNope, would be the same with two strips vs. one DR strip.
They both would produce same number of photones and when measured in the same height it would be the same. The only point where you get higher reading from DR strips is when you go 2" close to the light but in the same time there is much less light between two strips because it's too close for proper overlapping.
From the point where the light comes homogenous the intensity readings would be the same.
Two lights with HLG-240's, one with 10 SR the other with 5 DR strips would give you the same amount of light. The only difference with 10 strips would be a better homogenity when properly distributed. So less hotspot in the center but more bang on sides and corners. But average readings from both lights would be the same.
What's better, when a few leaves getting intense light and the rest sits in the shadow or when all leaves getting indeed the same amount of photones, but with less intensity?
Remember, photosyntesis gets more efficient with less intensity.
I've used COB's for a long time(8 CXB's above a 2x 4') and now use 20 2ft. SR-strips and it's obviously that the light reaches deeper into the canopy.
Almost no shadows because of 1440 light sources and multiple overlapping. 50-55klx above the whole canopy, no center hotspot and +85% intesity in the corners means no larf down to the bottom. It's mid of week 7 and I'm pretty sure this time only sugar leaves will find their way into my trim box.
And for anyone not sold on what randomblame is saying, this paper has the proof https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4559655/
Photons never interract with each other. Placing the light sources closer together does not magically cause the photons to travel further before dropping off in intensity. That's broscience/stonerscience in it's purest form.
Humple
Well-Known Member
The old HID "penetration" paradigm is well-entrenched. I expect it will be some time yet before everyone lets it go.
Randomblame
Well-Known Member
Randomblame
Well-Known Member
That's exactly what it describes! Very good find!
But I already hear the first "but" creeping around the corner ..., lol!
Moflow
Well-Known Member
Too right!
There was a light intensity thread a few weeks ago - a sensible discussion until the super troll with multiple names appeared and it all went pear shaped lol.
I asked a question and never received a satisfactory answer that "I wanted to hear" lol
coreywebster
Well-Known Member
What was the build cost of said 20 strip light R.B?You can check my signature to get an idea of my current lights.
Randomblame
Well-Known Member
I got a good deal last year from arrow with 20% discount(around xmas).
26 2footers and 10 Bridgelux V18c for 250$ shipped.
Subscribe to their newsletter this way you never miss a discount offer.
26 2footers and 10 Bridgelux V18c for 250$ shipped.
Subscribe to their newsletter this way you never miss a discount offer.
Aolelon
Well-Known Member
Randomblame
Well-Known Member
Search by part-no., their search engine is PITA...