Rahz' notes and observations

[Slinging PAR]

Kinda off topic but Ive got a tub of maxigro thats been setting in my shed for maybe 10 years, do fertilizers degrade if kept in a sealed container or would it still be good?

Does salt go bad?

 

[nogod_]

Dunno bud, but plenty comes out of your fingers every time you put them on the keyboard.

Does salt go bad?

 

[nfhiggs]

Does salt go bad?

Not bad per se, but it can turn into a big hard rock in high humidity, making it difficult to sprinkle on your dinner.

 

[Slinging PAR]

Dunno bud, but plenty comes out of your fingers every time you put them on the keyboard.

Being salts they should be fine... that's the point.

Mind you the quip is entirely true so kudos.

 

[CobKits]

So then what is the conversion for "LED" and where is it listed? I have not seen this for "LED" only Metal Halide, HPS, Fluorescent, etc. I'm not trying to troll here asking a legitimate question.

there is no one LED spectrum

 

[Evil-Mobo]

there is no one LED spectrum

Yup I know I was asking if there was one for LED in general. The old charts from all the companies only have other light sources listed in charts.

How you been bro good to see you around.....

 

[CobKits]

busy! ready for winter to be over...

 

[Evil-Mobo]

busy! ready for winter to be over...

I hear you on that I have a sunflower that needs to go outside ASAP lol.........

 

[alesh]

I had heard something in another lighting group circle that raised an eyebrow...
Is it possible for there to be two light sources with an equal lumen, lux, par, "output" but yet being at different "frequency".

Yes, it's possible. Two different sources can have equal luminous flux, equal radiant power and even equal photon flux and yet different SPD. Generally it's not the case, though.

So then what is the conversion for "LED" and where is it listed? I have not seen this for "LED" only Metal Halide, HPS, Fluorescent, etc. I'm not trying to troll here asking a legitimate question.

Different SPD means different "conversion factor". You have to use a different one for every LED. And this applies to any light source. There's no universal conversion for all HPS, MH, fluorescents.

 

[Evil-Mobo]

Yes, it's possible. Two different sources can have equal luminous flux, equal radiant power and even equal photon flux and yet different SPD. Generally it's not the case, though.


Different SPD means different "conversion factor". You have to use a different one for every LED. And this applies to any light source. There's no universal conversion for all HPS, MH, fluorescents.

Oh ok this makes more sense to me. See I thought the HPS,MH, etc values were all standard. Thanks for the clarification

 

[OneHitDone]

Yes, it's possible. Two different sources can have equal luminous flux, equal radiant power and even equal photon flux and yet different SPD. Generally it's not the case, though.


Different SPD means different "conversion factor". You have to use a different one for every LED. And this applies to any light source. There's no universal conversion for all HPS, MH, fluorescents.

I believe what @Evil-Mobo is referring to is this

https://www.apogeeinstruments.com/conversion-ppfd-to-lux/

 

[alesh]

Oh ok this makes more sense to me. See I thought the HPS,MH, etc values were all standard. Thanks for the clarification

They're...kind of standard. For example, HPS's of the same technology from various manufacturers usually have quite similar SPD so single conversion factor can be used. Margin of error is as big as is the difference in SPD.

 

[alesh]

I believe what @Evil-Mobo is referring to is this

https://www.apogeeinstruments.com/conversion-ppfd-to-lux/

Yes, I'm aware of this. I'd also guess that these particular ones also take into account Apogee sensors' not so perfect spectral response and therefore would introduce some kind of error if used with a meter that has a different spectral response. This is only a conjecture, though.

 

[Dave455]

I believe what @Evil-Mobo is referring to is this

https://www.apogeeinstruments.com/conversion-ppfd-to-lux/

Where is LED conversion ?

 

[lukio]

someone once told me for 3000k leds, i can divide lux by 69 for a rough guide. so 55,000 lux would be 55,000/69 = 797 ppf. is this this right- ish?

should i just buy a par meter? they're bloomin expensive

 

[Slinging PAR]

someone once told me for 3000k leds, i can divide lux by 69 for a rough guide. so 55,000 lux would be 55,000/69 = 769 ppf. is this this right- ish?

should i just buy a par meter? they're bloomin expensive

Get the PAR meter. Hydrofarm ones are under $200 and work great. Donate lux meter to struggling photographer.

 

[lukio]

Get the PAR meter. Hydrofarm ones are under $200 and work great. Donate lux meter to struggling photographer.

haha im a struggling photographer

i'll check em out, i can justify $200. cheers

 

[Randomblame]

That's the numbers and coversion factors for Sammy F-strips @wietefras posted in another thread. 5 column, PPF fact!

 

[Slinging PAR]

haha im a struggling photographer

i'll check em out, i can justify $200. cheers

We need more people to buy them to bring the price down. They should be as cheap or cheaper than lux meters but they just don't have the volumes of sales to justify discounts.

 

[lukio]

We need more people to buy them to bring the price down. They should be as cheap or cheaper than lux meters but they just don't have the volumes of sales to justify discounts.

well ive ordered one so that'll help...

It was actually £125 delivered, we normally get a lil more robbed in the UK.

@Randomblame ah right thanks!