Rahz
Well-Known Member
And yet I do.
To be clear, the average PPFD in a grow space is not the same as the PPFD of a small spot inside a grow space where a measurement is taken.
Will LED lights ever....
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To be clear, the average PPFD in a grow space is not the same as the PPFD of a small spot inside a grow space where a measurement is taken.
Just because they are dealing with a greater space doesn't mean that warehouse grows wouldn't benefit the exact same as a small grow would from led lighting. The efficiency doesnt change with a larger footprint. In fact, the potential to produce more per sq ft is there if you have the capital.
Rahz
Well-Known Member
This is nonsense. What do you mean by "them"? A 50 watt emitter? Against a 1000W bulb? Sure. But if you put 1000w of LED from a small source point 2-3 feet above the canopy the intensity will be there, apples to apples, and LED can do it with less wattage.
Additionally, even if the individual units are small the effect is additive.
BOBBY_G
Well-Known Member
utter nonsense in Yodaweed's post
photons per watt =game over
spectrum = game over
light distribution=superior by definition (reduced vertical height/luminaire distance is an advantage in every single aspect,esp see multi level warehouse parking 'garage' above)
capital cost is the single remaining argument for HPS...enjoy it while it lasts
a mongo frog
Well-Known Member
So it is true 800 watts of cob can do the same/greater than a 1000 watter? And your getting a 5x5 foot print right?
Cob is a loose definition. The efficiency changes depending on the cob and how hard it is driven. Yes, 800w of cob could could beat a 1000w but 500w could probably do it too if under driven. It all depends on the build.
a mongo frog
Well-Known Member
Ok, so if someone built a cob lamp the lamp has 4 rails with 4 cobs on each rail powered by 4 hlg 185 1400. Does that beat a 1000 watt hps? Or am i still not getting this cob thing yet?
Which cobs? Which bin?
a mongo frog
Well-Known Member
the 3590's and the best bin i guess.
cdgmoney250
Well-Known Member
Are you looking for a pre-built fixture or a DIY replacement?
A properly built DIY light will be capable of producing between 1.5-3+ oz per sq ft. regardless of efficiency.
(Strain/Skills dependent of course)
Efficiency just depends on how much you want to spend. Less wattage costs more. Or you could match wattage and increase your yield SUBSTANTIALY if using top of the line COB LED.
Do you want to do the same job as a 600 hps with 200 watts 300 watts or 450 watts?
It's all doable, that's why there are many variables to you original question.
cdgmoney250
Well-Known Member
Hands down, especially if using reflectors.
a mongo frog
Well-Known Member
And you do get a 5x5 foot print with that right?
Depending on the grower it should beat the 1000w.
800w at 56% efficiency is 448w of light from multiple sources and 352w of heat. The 1000w hps I'm going to guess is 32% efficient (I don't really know) and will make 320w worth of light from one source and 680w of heat. Judging by those numbers I would say the cxbs should out produce the 1000w.
cdgmoney250
Well-Known Member
If 10" - 12" spacing of COBs, you should get between 25 - 36 sq ft. of coverage depending on heighth above canopy.
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a mongo frog
Well-Known Member
What do you mean 25 - 36 feet?
cdgmoney250
Well-Known Member
Sorry, I meant 25-36 sq ft.
Fixed.
after all the info you have been provided you haven't figured it out ... and apparently you don't want to
hmmm your either very stupid or just an ordinary troll. lol probably just a stupid troll.
hmmm your either very stupid or just an ordinary troll. lol probably just a stupid troll.
Stephenj37826
Well-Known Member
Yep beats a 1000 hps all day long.
Stephenj37826
Well-Known Member
Sure just like you get a 5x5 footprint from a rather small gavita. As you raise the light you don't magically lose photons they are just spreading further apart. So to me the way I suggest to adjust a light is to raise it until the center levels are at your peak number mine being around 800- 1000 umol/m2 and then whatever footprint you got is what you got. There will be more photons hitting the canopy from the setup you mention than any hid fixture. Add the fact that the SPECTRUM is off the chain and you have yourself a real winner. Good luck with the build if you decide to go for it and if you need any help don't hesitate to ask.
churchhaze
Well-Known Member
Comparing PPFD of different lights is a suckers game and gives lighting distributors an edge in selling you a light. A PAR reading grid can help prove to a potential buyer that PPF is as rated, but in general, it's easy to be tricked by PPFD.
What matters when buying a light is not PPFD, it's PPF. (or watts of PAR).
PPFD can be made higher by packing the light in a small area (spectrum king) and using optics to focus it into an even smaller area.
It's true that PPFD is what the plants care about, but when buying a lamp, you should consider PPF the most. Watts PAR is essentially the same thing given similar spectrum, and it's easier to calculate, so just use that..
What matters when buying a light is not PPFD, it's PPF. (or watts of PAR).
PPFD can be made higher by packing the light in a small area (spectrum king) and using optics to focus it into an even smaller area.
It's true that PPFD is what the plants care about, but when buying a lamp, you should consider PPF the most. Watts PAR is essentially the same thing given similar spectrum, and it's easier to calculate, so just use that..