Lighting interesting article on plant light needs

[lonewolf25]

im jumping in a bit late on this but GPW is a guestimate once you have everything else correct, so if you had the best light ever but had crap nutes and no air flow you wont get the GPW thats quoted but if you did have everything kush then well hell you might even acheive greater gpw

also im running 250w ecolight cfl, and tbh cos i dont have everything like extracter etc on a bit of a bugdet experiment grow i dont think i will get anywhere near 1g/w still got a couple weeks left keep my fingers crossed but highly doubt it

 

[mauricem00]

minime, sorry I thought that that was what you meant by "oldschool".

You could have a look at CMH, while pretty cheap they are very efficient like big HPS. Of course led is a very good idea too. Depends on budget.


PAR measures the ppf photosynthetic photon flux. Lumens measures intensity based on human eye response curve (vlambda curve).
YPF yield photon flux accounts for quantum efficiency of wavelengths but is much harder to obtain.


PUR seems pretty useless to me, especially when looking at the paper you posted.Well it depends, I dont know if its based on YPF.



Well have a look at the billion dollar horticulture industry, they care for gaining $$$$$ by saving power big time.
Its not as easy as it looks. And the latest development -double ended bulbs increased efficiency again -unfortunately delaying a decrease in led cost.


Dont get the wrong idea, I prefer led any day over hps. Not only can they be better in efficiency, but also is their light beeing emitted in the "right" direction. You can spread the light with several smaller panels much better over the canopy. Beeing more efficient heat is reduced, spectrum can be adjusted...

-I just wish people get more sensitive to OUTRAGOUS claims of panel peddlers.

I have not seen a commercial indoor cannabis grow. the only commercial indoor grows I see are at nurseries and vertical farms. the nurseries use fluorescent and the vertical farms use fluorescent or leds.if there are large scale indoors farms I am unaware of them with the exception of experimental vertical farms.it has been a long time since I was in school and you are right. par is usually measure in u moles but this is not the proper forum to debate theory.