C
cccmints
- 75
- 18
I have noticed the COB datasheets display a range for the forward voltage of their COB, but the wholesalers of these COBs only advertise a fixed voltage. How do I determine where in the range I fall @ the current I'm aiming to drive? I will probably use hemp, thanks for the suggestion.your numbers for vero will prob be around 800w or more from the wall with a good meanwell driver.those veros at 1.75 amp will be around 37.5 to 38v i think so closer to 66w per cob x 12 =792w plus driver losses prob around 820w at the wall if i had to guess.still saving over 200w at the wall and this fixture should have a sizable increase in par in a 4 x 4 or 5 x 5 area. i would use hemp over any fruit/veggie/shrub/flower if you want a good idea of how marijuana will respond.
You can convert Lux to PAR. I even have a calculator that does it for me. Its best to buy a Lux meter because you really don't even need a PAR meter if you can observe the lux output of whatever light source you're observing.Lux is pretty irrelevant to be honest. What you're looking for is PAR/PPFD
Why do you say that? I'm not opposed to buying a PAR meter in addition to the Lux meter. Its just I've just seen people online do the conversion and I have a calculator which uses various inputs (one being nominal flux) to determine the PAR without having a PAR meter.I mean, you can try to convert lux to par. But it won't be very accurate.
Alright, I see what you're saying, thanks. So a PAR meter will be added to the list of things to order today.You can get a rough idea what the PAR is from lux, but there's a lot of variables. You're essentially counting apples to guess how many oranges you have when you go that route
Well the next thing I'm doing is building out a 12 COB fixture and purchasing the components for a "High-End HPS" fixture then running them in separate tents over what I suppose will be a yet to be determined strain of hemp. I need the lux meter to test the COBs individually for my 12 COB fixture design before running the side-by-side experiment, but I will then need a PAR meter to measure HPS' light degradation vs LED's light degradation.Tbh, I don't know that you'd need a PAR meter right away, but I suppose if you're purely doing this for testing it'd only make the most sense. I do have the hydrofarm par meter and my only complain is that the battery life sucks. But, it's rechargable
indeed..... lux and lumens are irrelevant ..... Lumens is for humans and play no part or lux in what a plant needs.Lux is pretty irrelevant to be honest. What you're looking for is PAR/PPFD
I said I'd be purchasing a quantum sensor and am questioning purchasing a lux meter in addition to that for the sole purpose of filling the input this calculator requires. Maybe the nominal flux is used to determine the value of one of the other variables this calculator has in addition to PAR (which I'd have a quantum sensor for).How good would the data be if you're not getting it correctly you're converting it so right there I would say your experiment is void.
If you're going to buy a light for growing and they talk about Lux or lumen I would instantly avoid it
Cheers
No, I don't see how you could surmise from my post that lux is irrelevant. PAR is directly connected to the flux output of the COB, which is why its showcased in their datasheets. Just because plants don't utilize the total flux output of a COB LED diode, doesn't render a lux meter useless. I'm not just trying to understand plant growth underneath these fixtures, I'm trying to use this COB technology to create an ideal light fixture as a replacement for HPS.Ok, so lux is irrelevant correct? You get this right, so if you need Lux to get calculations out of a calculator do you really think that's something you need because Lux is irrelevant, remember? That's like taking the letter M and try to divide it by 7 it's not going to happen cuz one of them is irrelevant.
Listen bro I don't have anything against you I'm trying to be for you by helping you out.
I'm not trying to put you off or tell you not to do it or be rude or anything that.
When talking about plant growth there is absolutely zero reason you would ever want to say the word Lux let alone have a lux meter.
Where did you even get the information that lux is what you need?
You said any info would be liked or something like that but either way you haven't took anybody's advice? Almost every post has no to lux but you keep saying lux!?
It does matter if you use a book of matches, a bic lighter, cob, cmh, whatever other light source...it doesn't matter!
The best piece of advice I can give you in this situation is drop the word Lux from your vocabulary unless you're are curious about the light you see or you're not doing an experiment or you're a home grower!
Does it measure light, yes! But not like it should!
Switch that word with ppf learn how efficient your lights are at par.
Photon efficacy, read about that
Ppfd take measurements all over the light pattern.
And I know people might say I'm being rude or something like that but did you ever go to college cuz it's how your professors will teach you it's not kindergarten anymore
That's like me trying to buy a house by going umbrella shopping! That's extreme but still you cannot do an experiment and have any actual facts based on stuff that's irrelevant.period. case closed. End of discussion.
Good luck and cheers!
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?