Help With Strip Spacing for 800 ppfd

nfhiggs · Jul 4, 2018

butterbudface said:
This will help me.

I am trying to determine the grow space. the strips are 4ft long, i need to find the spacing that will determine my growspace.

there is a data sheet for exactly the strip and driver that was used? not sure what more you want?

not the same space dude, this is a new room, i am keeping the old one as is. I understand that if you put more watts over the same space it will be more light.

I like to see the calculations on paper man.

It goes something like this

View attachment 4159830
View attachment 4159831

Yeah pretty much scaled it up from my cob setups, same amount of watts but they run way more efficient that why i want to try stretch the light out as much as possible if that makes sense.

I'm going to do as @nfhiggs said and try the samsung calculator.

Might post here for some more help.

From calculations I have been doing it only takes two single row strips per foot at about 120% of rated test current to get over 800 uMol PPFD range. If you double the strip density you only need half the current.

nfhiggs · Jul 4, 2018

butterbudface said:
I have been trying all morning, i am struggling with the samsung calc

Are you using the engine calculator or the component calculator?

sethimus · Jul 4, 2018

butterbudface said:
no, suck air through the tubing, works really well! also thought about doing a water thing but then i need a water chiller and i am not a fan of having water above my electronics man

so you just glued some endcaps on those profiles?

butterbudface · Jul 4, 2018

sethimus said:
so you just glued some endcaps on those profiles?

you knock it in

nfhiggs said:
Are you using the engine calculator or the component calculator?

ok now i see, i was using the engine calc, how do i get to the component calc? if i can find the coverage of a singe strip driven at 1.02A i should be able to calculate.

nfhiggs · Jul 4, 2018

nfhiggs said:
Are you using the engine calculator or the component calculator?

OK, here is what I came up with:

50 of the 3000K strips running at 1045 mA gets you 2400 watts and 421,380 lumens. Dividing by 69 gives us a little over 6100 PPF. Divide that by 800 (our target PPFD) gives us 7.63 square meters. Which just happens to almost exactly equal five 4x4 grids. So there is your answer - five 4x4 grids with ten strips per 4x4 grid and two HLG-240-48 drivers per grid.

ANC · Jul 4, 2018

http://dev.edman007.com/~edman007/pub/par-dli-cal.html

nfhiggs · Jul 4, 2018

butterbudface said:
you knock it in

View attachment 4159855

ok now i see, i was using the engine calc, how do i get to the component calc? if i can find the coverage of a singe strip driven at 1.02A i should be able to calculate.

The engine calc is the one you want to use - its got the F strip model numbers in it.

butterbudface · Jul 4, 2018

nfhiggs said:
OK, here is what I came up with:

50 of the 3000K strips running at 1045 mA gets you 2400 watts and 421,380 lumens. Dividing by 69 gives us a little over 6100 PPF. Divide that by 800 (our target PPFD) gives us 7.63 square meters. Which just happens to almost exactly equal five 4x4 grids. So there is your answer - five 4x4 grids with ten strips per 4x4 grid and two HLG-240-48 drivers.

Thank you. i can work with that. will do calculations from here. shot

butterbudface · Jul 4, 2018

nfhiggs said:
OK, here is what I came up with:

50 of the 3000K strips running at 1045 mA gets you 2400 watts and 421,380 lumens. Dividing by 69 gives us a little over 6100 PPF. Divide that by 800 (our target PPFD) gives us 7.63 square meters. Which just happens to almost exactly equal five 4x4 grids. So there is your answer - five 4x4 grids with ten strips per 4x4 grid and two HLG-240-48 drivers per grid.

is driver eff calculated into that equation?

nfhiggs · Jul 4, 2018

butterbudface said:
is driver eff calculated into that equation?

No, thats just using the output power to the strips, just add 7% to your 2400W to get total system power.

butterbudface · Jul 4, 2018

nfhiggs said:
No, thats just using the output power to the strips, just add 7% to your 2400W to get total system power.

you are correct! thanx man!

ANC · Jul 4, 2018

Use the engine calculator, it has a field for driver efficiency...

Then copy lumens, value and complete the fields that specify strip length as well as beam angle... into the par calculator I posted.

nfhiggs · Jul 4, 2018

butterbudface said:
you are correct! thanx man!

BTW, if you have not ordered the strips yet - you can save about $100 bucks (through Digikey) by ordering 100 of the 22" strips, instead of 50 of the 44" strips. You'll get the exact same light output.

butterbudface · Jul 4, 2018

nfhiggs said:
BTW, if you have not ordered the strips yet - you can save about $100 bucks (through Digikey) by ordering 100 of the 22" strips, instead of 50 of the 44" strips. You'll get the exact same light output.

i know right! i planned on doing this but got order qty to 250 on 44" strips so i'm good man but thanx. i tried explaining this very concept to another guy that just doesn't get it.

butterbudface · Jul 4, 2018

nfhiggs said:
BTW, if you have not ordered the strips yet - you can save about $100 bucks (through Digikey) by ordering 100 of the 22" strips, instead of 50 of the 44" strips. You'll get the exact same light output.

then you do a little array 2 in series and 5 of those in parallel.

Fubard · Jul 4, 2018

goofy81 said:
The real problem is that $100 can also add a few more strips. Lol
Download a phone lux meter and try to luck it out!

A phone lux meter app is as much use as a fart in a spacesuit, I tried several and they all read half of what a cheap lux meter did.

You can't map out squat if the meter is giving dodgy readings, so even buying a cheap lux meter from AliE or Amazon would be better

butterbudface · Jul 4, 2018

Fubard said:
A phone lux meter app is as much use as a fart in a spacesuit, I tried several and they all read half of what a cheap lux meter did.

You can't map out squat if the meter is giving dodgy readings, so even buying a cheap lux meter from AliE or Amazon would be better

That is why i like to work with datasheets and calculations and graphs. it can be a bit overwhelming if you don't have all the info. like the efficacy table seen earlier in this thread.

Shadrock15 · Jul 4, 2018

butterbudface said:
no, suck air through the tubing, works really well! also thought about doing a water thing but then i need a water chiller and i am not a fan of having water above my electronics man

Any chance you could help determine the correct driver to run 12 of these strips in a 7 sq ft area- i would like to run them around 1-1.2 amps to increase my output some and bring them up closer to the f series output but these strips are half the cost and failry efficient - i think

butterbudface · Jul 4, 2018

Shadrock15 said:
Any chance you could help determine the correct driver to run 12 of these strips in a 7 sq ft area- i would like to run them around 1-1.2 amps to increase my output some and bring them up closer to the f series output but these strips are half the cost and failry efficient - i think
View attachment 4160032

They are effitient it seems, only reason they are half the price is they are half the wattage. I would do a 240 hlg or elg series 42v . HLG-240-42A

Then wire 2 in series and 6 of those in parallel. You should be able to get then driven at 1.05a.

How much you paying for f series and what does these cost? I still think 5 x f series strips would outperform 12 of these.

Send link to data sheet. Temprature and drive current affects the forward voltage. I want to have a look at the graph

Shadrock15 · Jul 4, 2018

BXEB-L0280Z-35E1000-C-B3
So i got the imfo i have from digikey i just put the part number above in and came up with info i sent - i couldnt get the data sheet to open ( digikey website doesnt cooperate with my iphone so well) but they are 6.50 each compared to 15.50 for f strips - do you think 5 f strups would veg and flower 4 plants in a 7 sq ft area as far as voltage the 2 ft f strips are 23v at 1.2 amp and the ed strips are 19.5 @ 700ma so if druven at 1amp or 1.2 like He f series im at 19.5 to 24 v the way i figured it would be about 260-280w and about 49k lumen ( i know lumens arent best way to measure eff. But thats all i got to work a comparison with

Help With Strip Spacing for 800 ppfd

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