> On Sun, 18 Nov 2007 17:02:07 -0600, Mike Ross
>
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>
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> REMOVEcomcast.net> wrote:

>>Due to the summer heat in my attic, I tried to initiate flowering by

> having

>>the lights on 11 hrs at night, and off 13 hrs during the day, hoping

> to

>>keep the peak temperatures down.

>

>>4 weeks of this lead to absolutely no flowering! They didn't even

> begin

>>flowering until 2 weeks after they went to the big bed, which is on

> 12 hrs

>>during the day. Messed up my schedule big time.

>

>>The next batch was flowered with a normal day cycle, and flowered

> well at 2

>>weeks, so I'm lead to believe that light and heat periods should be
>>aligned, or that heat during the dark period prevents the flowering
>>hormones from developing. So make sure the cool period comes at

> night.
>

>>-mikey

>
> I also use a night time lighting scheme to prevent overheating in the
> summer and underheating in the winter. It gets up to 100 in my
> location in the summer. I've flowered s few plants in the last 32
> years, and I've only seen two things prevent plowering. Once the timer
> broke, and the lights were on 24 hours: the other time, I had the
> system on 6 hours on - six hours off to test if it was the length of
> the dark time, or the total of the dark hours, that cause flowering.
> Point being, as I discovered after doing that, the only thing that
> prevents flowering is not enough continuous dark time. Heat won't
> prevent flowering unless it kills your plants. I'd suggest either your
> timer was busted, or you had a large light leak, maybe for only a few
> minutes a day, but big enough to do the job. If the dark period is cut
> in two by a period of light, that is enough to stop flowering
> completely.
>
> As the other poster mentioned, moonlight levels aren't enough. But a
> daytime sunshine leak in the roof that hit your light shielding in
> just the right place to penetrate through a crack, that would do it.