Grumpy Old Dreamer
Well-Known Member
I suppose if you take off the "twilight" hours when it is officially daylight but the amount of light wouldn't be much good for the plants, it does shorten the day quite a bit.and daylight hours don't need to fall to 12 in nature
In Brisbane we never actually get more than 14 hours "official" daylight and the further north you go, the lower the maximum daylight hours.
I have found the "less than 14 hours daylight" to be very useful, once I trigger flowering in a plant (or a whole bunch of clones) they will not reveg and can be grown outdoors as small, easily concealed plants.