Am I overkilling it on lights?

crimsonecho

crimsonecho

Well-Known Member
Dank Bongula said:
I just typically use a par map as a baseline and watch the leaves' response. I am a home hobby grower, typically no more than 3 plants in each tent (2) at a time. Where is a good starting point/source in reading up and learning more about dli? Or is it even necessary for my situation?
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dli is not some mystery man, just the total amount of photons falling onto the plant during a day. as you see in a prior post 40-45 is the most you’ll need in most cases and as a hobby grower you can go with even less. there are online calculators too. just google dli calculator and you’ll get many results. you should get the average umol reading of your canopy and use that to calculate dli.

like see this par map, there is a value in the middle, circled, i’m guessing thats the average of the canopy (may not be havent calculated it personally). so you use that to calculate dli. so eventho mids can read 1400 and edges can be 250 the average is 1000 and that translates to about 43 mol/m2. which is a good dli.

but of course the mids which get 1400umols can still show light stress as the spot reading can be as high as 60mols and thats intense so an even distribution of light is the tits. if you could distribute that light as 1000umols edge to edge over the whole canopy that would just be easier on the plant without altering dli. pretty much what sun does.

there are also dli maps, this is how many mols of light hits the earth each month. this is a baseline of course individual spots and circumstances will create differences.
 

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Star Dog

Star Dog

Well-Known Member
crimsonecho said:
dli is not some mystery man, just the total amount of photons falling onto the plant during a day. as you see in a prior post 40-45 is the most you’ll need in most cases and as a hobby grower you can go with even less. there are online calculators too. just google dli calculator and you’ll get many results. you should get the average umol reading of your canopy and use that to calculate dli.

like see this par map, there is a value in the middle, circled, i’m guessing thats the average of the canopy (may not be havent calculated it personally). so you use that to calculate dli. so eventho mids can read 1400 and edges can be 250 the average is 1000 and that translates to about 43 mol/m2. which is a good dli.

but of course the mids which get 1400umols can still show light stress as the spot reading can be as high as 60mols and thats intense so an even distribution of light is the tits. if you could distribute that light as 1000umols edge to edge over the whole canopy that would just be easier on the plant without altering dli. pretty much what sun does.

there are also dli maps, this is how many mols of light hits the earth each month. this is a baseline of course individual spots and circumstances will create differences.
Click to expand...
Ok...once you work out how many photons are falling on the plant then what, like how do apply that in a practical sense?
 
Star Dog

Star Dog

Well-Known Member
I've installed the photone app on my Sony zx android but using a se3000 at 50%/20" it keeps reading of the scale with 233 ppfd or thereabouts.
Do they figures sound way off?
The app maxes out easily but at the right distance it's within 600 lux to my light meter so I know that part fairly accurate, any previous apps I've tried have been way off.

@LeastExpectedGrower thanks for the link dude! I appreciate that.
 
LeastExpectedGrower

LeastExpectedGrower

Well-Known Member
Star Dog said:
I've installed the photone app on my Sony zx android but using a se3000 at 50%/20" it keeps reading of the scale with 233 ppfd or thereabouts.
Do they figures sound way off?
The app maxes out easily but at the right distance it's within 600 lux to my light meter so I know that part fairly accurate, any previous apps I've tried have been way off.

@LeastExpectedGrower thanks for the link dude! I appreciate that.
Click to expand...
223umol is probably less than I’d go unless it’s a new seedling. I start out around 200-150 when just sprouted and go up from there.

I have both Photone (iPhone XSMax) and in comparison to my Phantom Photobio it’s in the range of 4-8% in comparison, so pretty close.

These days generally follow the light guidelines in thatonline calculator and it hasn’t led me astray yet.
 
1

1212ham

Well-Known Member
Star Dog said:
I've installed the photone app on my Sony zx android but using a se3000 at 50%/20" it keeps reading of the scale with 233 ppfd or thereabouts.
Do they figures sound way off?
The app maxes out easily but at the right distance it's within 600 lux to my light meter so I know that part fairly accurate, any previous apps I've tried have been way off.

@LeastExpectedGrower thanks for the link dude! I appreciate that.
Click to expand...
Am I the only person that can see the Beta banner on the app?

Photone for android is totally unreliable!
 
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