Ppfd distance calculation

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blazebug65

Well-Known Member
Found it a while back but forgot it. I'm looking for a site that has a calculator where you can put in the ppfd of your light and what height you want and it gives you said reading. Does anyone know of this?

Thanks
 
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Delps8

Well-Known Member
You might check ppfdcharts.com and see if your model is listed. Other than that, unless you have the data from the manufacturer the best that you're going to get is an estimate. The inverse square law still applies but applying it to a grow light is an exercise in frustration.

What model light do you have?
 
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blazebug65

Well-Known Member
Delps8 said:
You might check ppfdcharts.com and see if your model is listed. Other than that, unless you have the data from the manufacturer the best that you're going to get is an estimate. The inverse square law still applies but applying it to a grow light is an exercise in frustration.

What model light do you have?
Click to expand...
Bloomspect sl600
 
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Delps8

Well-Known Member
blazebug65 said:
Bloomspect sl600
Click to expand...
There's a PPFD map for this light on Amazon. They show PPFD values for a few different hang heights. Check out the light values for the Mars TS 600 which has a similar max output in the center. One thing to watch out for is the output for your light drops pretty quickly once you leave the center of the light. That impacts how you might want to train/not train your plant.
 
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Delps8

Well-Known Member
That checks out with the PPFD map on Amazon. I tried to compare the two maps but it's not easy because the video uses 6" grids and the PPFD chart on Amazon uses grids that are 10cm.

While the amount of light at the center is tells us the highest PPFD at that hang height. An important factor lighting a canopy is to see how much light is where and you've got good light 6" in all directions from the center point and you've got decent light except for the corners. 500 µmols for 18 hours will get a DLI of 32 (500 * 18 * 0.0036) and that's enough to get to done.


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mrgreenbudz

mrgreenbudz

Well-Known Member
NICK72690 said:
I’m also interested in this calculator, also the Photone app is fairly accurate
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Been running the Photone app for a few months and think it is also pretty darn good I don't even pay attention to what the light company says I go off the app and set my PPFD depending on what stage I am at. So far all has been nice on two runs
 
NICK72690

NICK72690

Well-Known Member
At first I was like no way that’s like when people said there’s a scale app that uses your touch screen lol but no the light app works fine!
 
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