Anyone adjust for other than 24/hr days to flower?

It seems everyone is basing their light schedules on a 24 hour period, but growing inside we aren't bound to 24 hour days. So I'm curious if just the 12/hr light duration is the only trigger needed to flower, or does it really need 12 dark as well? Say for example 12 on/4 off?
If so I'm thinking a flowering period of 8 weeks could be reduced to 5-1/2. Both have the same number of "days" and total light, just 16hr days vs 24hr.
Or it could be the darkness only that triggers it... In that case how about 18-24 on/12 off?
Surely one or the other time frame can be adjusted, the question is how much?
Anyone hear of any experiments along these lines?

the 12/12 simulates the shortening hours of sunlight of the season and signals to the plant fall is approaching and that is why it goes into flower mode. That is why there is a Veg cycle with more hours of lighting and 12/12 for flower. If you want more specifics read the grow faq it should explain things fairly well.

I have read threads here where folks experiment with it best way to search for em is by using Google

the best result I saw was doing 8/8 which trims 1/3 of a day every day

but results were not as good as 12/12

why everyone uses it

We are bound to 24 hr day schedule. When we grow inside we are trying to mimic the ideal outdoor grow scenario. You can keep your lights on for 24 hrs during veg although there is no real proof that it makes your plants grow faster. 18 hours on is more than sufficient. If your plants are in the dark for longer than 6 hrs they will automatically think it is time to flower. The plants DNA is what tells it what to do based on the photoperiod it receives. Flowering is a survival reaction by the plant. It enables it to be pollinated thereby producing seeds that will grow the following season preserving the genetic lineage of the original plant.

Alternatively there are some autoflowering strains that require at least 16 hours of light daily to flower. These strains are crossed with the Ruderalis family of Cannabis species. Cannabis Ruderalis is the stuff growing on the side of the highway all up and down the great plains states. Almost no THC commonly used for hemp fiber.