Please help lighting intensity?

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plumsmooth

Well-Known Member
I have a HLG Scorpion Diablo running with no co2.
Originally when I checked PAR against my 315 CMH's I discovered they measure the same at 15 inches so I figured why shouldn't they be able to handle the same distance as my CMH?

Took me this long to discover another form of measurement that has to do with Accumulation, like total hours or something, that is important? In other words just because my Large plant can take 2 315 CMH's at 15 inches fpr 12 hours, doesn't necessarily mean it want a 600 Watt Diablo at 15 inches for 12 hours? Even though the PPFD measurement is identical?


Allow me to explain: There are 6 boards on the diablo. Each one seems almost equivalent to 1 315 CMH by Par and footprint measurement! This is 3x the light of running 2 X 315 CMH!!!

So just because the individual output of one of the 100 Watt boards in the Scorpion Array is equivalent to a 315 doesn't mean that they want 6 of those on itself (plant) etc...

Can some one help me here. Seems to be my yield was the same or better running it over 2 feet, until I discovered the Photome Phone Light Meter and concluded that the intensity matched the CMH...

And I brought it down to 18 inches. I am starting to think 2 FOOT at maximum intensity over one of my Trees is best? Even 3 ft although I need to train my pants a little shorter because of minimal ceiling height!IMG_1035.JPG
 
Grower5744

Grower5744

Member
Download the tent buddy app if your on Android. Its extremely accurate, and extremely easy to set your lights correctly
 
Kassiopeija

Kassiopeija

Well-Known Member
plumsmooth said:
Allow me to explain: There are 6 boards on the diablo. Each one seems almost equivalent to 1 315 CMH by Par and footprint measurement! This is 3x the light of running 2 X 315 CMH!!!
Click to expand...
Why not simply compare the PPF of each fixture to know how many photosynthetic photons each fixture generates every seconds?
Then there is the fixtures light-spread.
With distance arriving at a specific field density of these photons projected over an area.
 
M

Moist.Farms

Member
It seems a bit weird to try and just match what you had with CMH.
The only things that really matters here are even light spread, and then DLI. DLI is essentially PPFD x Duration of Lights on.
You want to get the DLI up as high as the plants can take it, but obviously making sure the light spread is even so there aren't different DLI values across the canopy.

You can use a lot of tools to adjust DLI. Light height, light strength (dimmer), Hours lights on ( 11.5/12.5 or even 11/13). There are a lot of different adjustments you can make to both maximize even light spread and reaching the highest DLI.

Im not sure if anyone is going to be able to tell you exactly how to set it up but with the Photone app you should be able to dial it in pretty easy.
Harvest part will be waiting 24hrs to see if the plants are handling a certain DLI.
 
Kassiopeija

Kassiopeija

Well-Known Member
And even the expensive ass meters are not that accurate with cutoffs at e.g. 692nm or UV thus missing out on 100-200nm of wavelengths plus not weighing all the PAR frequencies equally.
The hardware specs on the other hand were done in an Ulbricht-integration sphere, at least, when the manufacturer is integer.
 
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