$1200 dollar budget for 8'x4', strips or Cobs?
- Thread starter Shua1991
- Start date
Serva
Well-Known Member
What do you mean? EB strips (gen2) will hit 190 lm/w and Samsung F series will hit 200 lm/w, if run softly. Q series can hit 220 lm/w, but it‘s not affordable to run them that soft with the currently avaible designs.
2 EB strips, 2ft = 1 F series, 2ft
So F series or any other LM561C build is only a better choice atm when you want to beat 190 lm/w. F series costs twice as much. 2x EB strips will have 3x more diods than 1x F strip. This will give a better light, because it‘s more diffuse.
A more diffuse light can penetrate deeper, a special training as mentioned isn‘t necessary so much, than with single source lights.
For 1200$ you can cover 5/6 of the canopy completly with EB strips running them at nearlly 190 lm/w, and 500-600w (max) would be sufficient without co2.
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CobKits
Well-Known Member
do you want to cover 5/6 of the canopy or do you want to cover all of the canopy?
CobKits
Well-Known Member
no. "penetration" is probably the most misunderstood concept
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Cold$moke
Well-Known Member
Thanks for the info this means i need to study more
CobKits
Well-Known Member
can we see the math on that? (# of strips and current per strip).
nfhiggs
Well-Known Member
I think it might be tough to hit that with the EB strips. They are rated for 175 lm/W but the rated test current is only 42 mA per diode. They already run them really soft to hit that. The Samsung F series, OTOH, actually run pretty hard at their rated test current of 125 mA per diode for 171 lm/W
Cold$moke
Well-Known Member
Thanks for that im a visual learner that was good
jonsnow399
Well-Known Member
That's what the old lady keeps telling me.
nfhiggs
Well-Known Member
24 of the 4 ft strips running at rated current of 700 mA at 39V is 655W at a cost of $325 for the strips plus the driver cost. No heatsinking needed, just a basic frame. That get you to 175 lm/W and about 115k total lumens. To get them to 190 lm/W you would have to double the number of strips and run them at 350 mA. That puts you at 100 strips for both tents at a cost of $1300 just for the strips. Its doable at their spec, but IMO, its not worth the cost trying to get 190 lm/W out of them.
Serva
Well-Known Member
Sorry, my mother tongue isn‘t english, and it‘s alread hard enough to write sentences, someone can understand... so yes, I guess you already noticed it, „completely“ was wrong.
But if this wasn‘t a rhetorical question, no I don‘t want cover all possibilities for air exchangement... 5/6 of he canopy seems pretty ok though.
wietefras
Well-Known Member
a 3000K 80 CRI LM561C will be at 60% when the efficacy hits 194lm/W. Which means you need to drop the mA from the standard tested 1120mA to 630mA (or double that for the 112cm double row strips).
Serva
Well-Known Member
https://www.rollitup.org/t/bridgelux-eb-series-build.928676/page-94#post-14050509
I run nearlly all my EB strips at half current. I don‘t see any reason to run them at nominal current?! The spread is way better this way... 2x better spread than F-series, and 3x more diods... sounds reasonable to pay 16% more for the EB strips.
And if you want to save some money, don‘t get than many strips, run them for 180 lm/w, but also for 1000$ you will have nearlly 2x more EB strips than F to spread. Covering atleast half of the canopy will give such a great uniformity and penetration. While lowering the distance between light and canopy will increasy efficiency...
Serva
Well-Known Member
Actually, what you mean is 50 not 100 strips? Why 24 strips before?
To be more accurate for a 4x8 we need around 1000w (31 w/sqft), running 70x EB strips at 350ma will match this: 950$
Or
35x F-series for same efficiency, but only 1/3 diods, and 1/2 spread: 720$ (-25%)
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Randomblame
Well-Known Member
LM561C - A1/S6 - 3000K @65mA
VF: 2.9V (max)
Flux: 34.5 lm (min)
QER: 321.6 lm/W
LER: 4.86 µmol/J
-> 2.766 µmol/J
F-Series Gen3 3000K@1120mA
Flux: 4335lm, 168lm/w
QER=4.86 µmol/J
LER=321.60 lm/W
= 2.54 µmol/J
25.8W * 2.54 µmol/J / 14.48$ = 4.53 µmol/$
4000°k F-strips @525mA(~58mA per diode) delivers ~12w with +200lm/w which means ~2,8μMol/J.
3000°k strip would be in the 195lm/w range..
Rahz
Well-Known Member
Most home owners are working with tents. Even if the tent came 4 poles short, you can get just as close with cobs if you know what you're doing.
wietefras
Well-Known Member
@Randomblame I got a LER of 323,4 for the 3000K LM561C. QER is 4.69 for the 400-700nm PAR range (4.85 for the full range).
Convert from lumen to par PPF by dividing by 69. For the YPF divide by 78.
Convert from lumen to par PPF by dividing by 69. For the YPF divide by 78.
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