Rider's first foray into LED strip lighting: Samsung H Series GEN3

Rider509 said:
OK, guys, I need help checking my train of thought on determining expectations for luminous flux. We have to take an educated guess on efficacy but given what we know from the data sheet it should get us very close. Here goes:

Driving the strips at 500W, or about 75% of their max current puts us in the 185lm/W range.
500W x 185lm/W = 92,500lm

But I measured 98,000lm.
98,000lm / 500W = 196lm/W, which exceeds the max listed luminous efficacy of 190 lm/W at max current.

What the hell am I doing wrong?
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I'd tell you but wouldn't want to make you look stupid in front of everyone...
 
Tunkers said:
I'd tell you but wouldn't want to make you look stupid in front of everyone... 廊
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I appreciate that, buddy, since I appear to be doing a good job of that already. Life was a lot more simple when our choices were limited to 400, 600, and 1000W bulbs.
 
Yea I'm definetly too dull for all this, Christina is still my go to XD
 
I'm sure I just forgot to carry the 1. The mistake is in here somewhere.

commonroomsept2015.jpg
 
I'm pretty sure it's because they are using the maximum as the constant variable I those specs. Wouldn't the lights have a higher lumen per watt ratio if they are run at lower power? Less heat = more efficiency correct? Maybe I'm just high.....

Is there an effect of overlapping lights? I know for some specs simply adding the figures will not suffice because 1+1=3 just as an example. Again I'm way outta my leauge but I know math and physics.
 
It seems like a slouch at 12" but what about at 8"?
The Inverse Square Law comes into play! :cheertwo:

E2=(d1/d2)**2*E1

12 inches.................8 inches
44,100lm ----------> 99,200lm
460-520ppfd ------> 1030-1170ppfd

Think you could grow with that? Better break out the CO2! LOL. It def got me thinking. It's only drawing 212W at the wall and the coverage is insanely uniform, and the heat is spread out evenly over the 2x4 area.
 
I always get a little lost in the lumen/Lux and ppf/ppfd conversions, as well as the distance to measure at when distance is appropriate, which isn't always the case. :hmmmm:

I'm pretty sure umols are measured at 24" although I've never understood why. And Lux applies to the lit area whereas lumens don't, like ppf applies to the source and its emmisions, and ppfd applies to the light received by the lit area. ~sigh~

I know that in a 4x4, 100,000 lumens should equal 1000 umols, roughly, if that helps with calculations. But, ahem, I don't know at what distance lumens are measured. :cheesygrinsmiley: I just crunch the rated numbers - no meters.

:Namaste:
 
Lumens is to Lux as PPF is to PPFD. The first is a measurement of total radiated energy of a finite spectrum range. The second is a measurement of how much of that energy is radiated onto a surface area equal to one square meter.

And there really is no reliable way to convert lux to PPFD because they are measuring two different things. Plants can "see" what we can't. That's why a PAR meter is needed when assessing grow lights. Somewhere way back in this thread I typed up an explanation of the terms in a way that I hoped would make sense.
 
Remember how we discussed that the inverse square law didn't work so well in tents and with multiple point sources? Moving the lights to 8" barely budged the meter. :)

580-620ppfd

I'm getting bored with lights. Need to blow some shit up.
 
Rider509 said:
And there really is no reliable way to convert lux to PPFD because they are measuring two different things. Plants can "see" what we can't. That's why a PAR meter is needed when assessing grow lights. Somewhere way back in this thread I typed up an explanation of the terms in a way that I hoped would make sense.
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If you know the PAR conversion factor, you can easily convert from lumens to Lux, and then to ppfd. Lux = lumens per square meter.

:cheesygrinsmiley:

Lux>ppfd......................ppfd>Lux
0.0290..... Grolux floro.......34
0.0185..... sunlight............54
0.0183..... blurple............. 55
0.0170..... CMH Agro......... 59
0.0154..... CMH ...............65
0.0151..... LM561c............66
0.0150..... Cree3590.........66
0.0141..... MH..................71
0.0135..... Fluoro(CW).......74
0.0130..... 1000DE............77
0.0122..... 600HPS............82
 
So is there a reliable way to calculate the optimum distance for a light (without needing c02)?
 
Graytail said:
If you know the PAR conversion factor, you can easily convert from lumens to Lux, and then to ppfd. Lux = lumens per square meter.

:cheesygrinsmiley:

Lux>ppfd......................ppfd>Lux
0.0290..... Grolux floro.......34
0.0185..... sunlight............54
0.0183..... blurple............. 55
0.0170..... CMH Agro......... 59
0.0154..... CMH ...............65
0.0151..... LM561c............66
0.0150..... Cree3590.........66
0.0141..... MH..................71
0.0135..... Fluoro(CW).......74
0.0130..... 1000DE............77
0.0122..... 600HPS............82
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good stuff man, Thats what Ive been going by also. But Rider is getting 600hps ratio on these strips and not the 561c which id presum is closest to the strips.

Perfect sun is 54 ratio, Neils lights rock man,
 
Mayne said:
good stuff man, Thats what Ive been going by also. But Rider is getting 600hps ratio on these strips and not the 561c which id presum is closest to the strips.

Perfect sun is 54 ratio, Neils lights rock man,
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Ahhh, grasshopper, but both H and F Gen3s do use the LM561C. In fact, the F Series is using S7 bin chips in the 80CRI line now.
 
Rider509 said:
Ahhh, grasshopper, but both H and F Gen3s do use the LM561C. In fact, the F Series is using S7 bin chips in the 80CRI line now.
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In my Ace voice, " iiiiiiiii did not kno that"

Im using Z2 bin, 40cri

BWHAHAHAHA
 
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