Efficiency matters

Rahz

Rahz

Well-Known Member
I already posted this in a topic but though it could use it's own thread. The first picture is the PAR map of a well known manufacturer's lamp. It's a "900" model and the claim is that it replaces a 1000w HPS. It's actual power draw is 418 watts. The second picture is the PAR map for the T22. It's actual power draw is 200 watts.

The average of all the measurements for the red/blue light is 222. The average of all the measurements for the T22 is 256.

Conclusion: The amount of light delivered per watt from LED can vary so much that a lamps "true wattage" is all but meaningless.

Blurple.jpg T224x4par.jpg
 
stardustsailor

stardustsailor

Well-Known Member
Rahz said:
Conclusion: The amount of light delivered per watt from LED can vary so much that a lamps "true wattage" is all but meaningless.
Click to expand...
Totally agree.
:clap:
Quite a few people seem to forget that LEDs are actually diodes made of various semiconductor materials.
And they behave like that.
Let alone what happens from the light emission stage and afterwards ...
:wink:

Allow me,my brother ,to add few further notes.

Wattage ( @Plug ) is useful to calculate the electric energy consumption and nothing more than that.

In order to fully evaluate the "abilities" * of a solid state lighting device ,few other variables are needed.

1) The quantum efficiency of the DEVICE (not just the light source(s) ) .

2) PAR 2D or 3D mapping.

3) Source flux (total ) output of the PAR ( PPF ).

4) The YPF of the PAR.

5) The relative output power spectral distribution graph of PAR.

6) the R:FR ratio of PAR.
( quanta from 650-670 nm range / quanta from 720-740 nm range ,
other alternative is the quanta ratio of 650 nm / 725 nm )

7) P.P.E. Phytochrome photoequilibrium of PAR
( aka P.S.S. =Phytocrome photostationary state ).
PPE/PSS = Pfr / ( Pfr + Pr )
Here some more info on how to calculate PPE/PSS - needs digitizer & spreadsheet :
https://cran.r-project.org/web/packages/photobiologyPlants/vignettes/userguideplants.pdf

8 ) The electrical efficiency of the device ,
or to put it in other words ,
the amount of heat dissipated from the light source(s),drivers,etc.

* where "abilities " means the quantity and quality of harvest versus the energy (money) spend .

For example :

http://cpl.usu.edu/files/publications/publication/pub__4124704.pdf

http://www.dsls.usra.edu/meetings/bio2001/pdf/043.pdf

Cheers.
:bigjoint:
 
Last edited:
salmonetin

salmonetin

Well-Known Member
stardustsailor said:
Totally agree.
:clap:
Quite a few people seem to forget that LEDs are actually diodes made of various semiconductor materials.
And they behave like that.
Let alone what happens from the light emission stage and afterwards ...
:wink:

Allow me,my brother ,to add few further notes.

Wattage ( @Plug ) is useful to calculate the electric energy consumption and nothing more than that.

In order to fully evaluate the "abilities" * of a solid state lighting device ,few other variables are needed.

1) The quantum efficiency of the DEVICE (not just the light source(s) ) .

2) PAR 2D or 3D mapping.

3) Source flux (total ) output of the PAR ( PPF ).

4) The YPF of the PAR.

5) The relative output power spectral distribution graph of PAR.

6) the R:FR ratio of PAR.
( quanta from 650-670 nm range / quanta from 720-740 nm range ,
other alternative is the quanta ratio of 650 nm / 725 nm )

7) P.P.E. Phytochrome photoequilibrium of PAR
( aka P.S.S. =Phytocrome photostationary state ).
PPE/PSS = Pfr / ( Pfr + Pr )
Here some more info on how to calculate PPE/PSS - needs digitizer & spreadsheet :
https://cran.r-project.org/web/packages/photobiologyPlants/vignettes/userguideplants.pdf

8 ) The electrical efficiency of the device ,
or to put it in other words ,
the amount of heat dissipated from the light source(s),drivers,etc.

* where "abilities " means the quantity and quality of harvest versus the energy (money) spend .

For example :

http://cpl.usu.edu/files/publications/publication/pub__4124704.pdf

http://www.dsls.usra.edu/meetings/bio2001/pdf/043.pdf

Cheers.
:bigjoint:
Click to expand...

link dont go ok... other link?
http://cpl.usu.edu/files/publications/publication/pub__4124704.pdf
 
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