How can i calculate GPW form efficacy

A

anajo3

Member
i know it's a wrong qustion , but can i calculate estimately GPW form PPFD/W
like this graph i want to know estimately GPW
for example when i use VERO29 C #1 and CLU048-1212
on same wattage : 100w
VERO29 C #1 on 100w > 9.2 PPFD/W
CLU048-1212 on 100w > 7.7 PPFD/W

how much difference GPW between this LEDs?
same strin same farmer with best skill

how can i calculate GPW form PPFD/W
thank you for your help :lol:
photo_2021-03-08_10-14-59.jpg:lol:
 
mc130p

mc130p

Well-Known Member
g/W has units of mass*time/energy, but what you want to determine efficiency is g/energy, so you should integrate your measured power utilization over the grow period and then divide into the mass of the harvest. in short, you can not convert PPFD/W into g harvested/energy.

PPFD is a measure of light output by the light source, not a measure of the utilization of light by the plant. these plots show that the rate of photon emission from the source asymptotically approaches a maximum, so if you add more power, the lights don't get much brighter in intensity and even though you get a brighter light, you are spending more energy to get a photon.
 
Last edited:
MidnightSun72

MidnightSun72

Well-Known Member
Rocket Soul

Rocket Soul

Well-Known Member
anajo3 said:
i know it's a wrong qustion , but can i calculate estimately GPW form PPFD/W
like this graph i want to know estimately GPW
for example when i use VERO29 C #1 and CLU048-1212
on same wattage : 100w
VERO29 C #1 on 100w > 9.2 PPFD/W
CLU048-1212 on 100w > 7.7 PPFD/W

how much difference GPW between this LEDs?
same strin same farmer with best skill

how can i calculate GPW form PPFD/W
thank you for your help :lol:
View attachment 4874988:lol:
Click to expand...
Easiest way to get an idea would be comparing the output: 7.7 is 83% of 9.2, so about 20% more yield with the caveat that you need to know how to grow with the extra light.
 
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