Light Trigger Number

Ghostbustaar · Aug 13, 2014

Over the years ive experimented a bit when it comes to spring clones and revegging and that experience combined with the fact that ive grown well over 100 strains has given me some insight into the flowering aspects of hybrid cannabis.

Most hybrid, indica containing Cannabis will begin to flower near the 14.25 - 14.5 hrs of light. Above 14.5, most plants will veg. Below that and most will trigger flowering. If you have plants indoor under lights, you can measure it by keeping lights under 14. 45 minutes of light - they wont flower. Reduce the lights by 15-30 minutes and the plants will flower evey time.

Outdoors you can do the math yourself. At my lattitude, i see flowers for most plants around the 1st of August. Since i know that it takes approx. 2 weeks from the time light is cut back enough that flowering is inititated until one sees actual flowers begin to form, you automatically know that the daylength that triggered the flowering actually occured 2 weeks ago. MId july at my lat is 14.3-4.

You can also determine approx. finish date by adding the flowering time to the numbers. My plants trigger mid july. I see flowers forming Aug 1. My strain is a 60 day flowerer. Aug 1+ 60 days = October 1. Drought, cloudiness, heat and other aspects can effect it a little, but generally thats the math.

I wish instead of breeders providing a finish date with the seeds, they would give us the light trigger number. This plant will flower under so many hours/minutes of light. That way we could go straight to the daylight tool and know when they will flower and finish at our lat.
Click to expand...

From an other forum I came uppon while looking for the aproximate finishing time for my white widow.

So if this is correct the light trigger point technique to determine the flowering and finishing time is very simple. Never seen it that way before, may help somebody else.

So my ww should be good by late september!

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Korbin · Aug 13, 2014

Nice post def taught me something

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Ghostbustaar · Aug 14, 2014

I forgot to mention : Here's a website that shows the hours of daylight received during the year for an observer at a given latitude.

Verry helpfull to determine the triggering light point.

http://astro.unl.edu/classaction/animations/coordsmotion/daylighthoursexplorer.html

It does not work on mobile!

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