Lighting What's the best lighting cycle for autos - 24/0, 20/4 or 18/6

[bad dragon bzzz]

only been growing 2 and a bit years.started 20/4 then 19/5 then 18/6 each time my plants got bigger,thats not scientific i was a shite grower to begin with.and im not much better now.
a fat guy in a lab coat told me ruderalis % of growth after 17.5 hours of light drops off the scale.so now im changing to 17.5/6.5
after all the years of autos i would of thought proper scientific work would have been done,and we would all have a definitive answer.
electricity costs/temps etc means everyone will have a favorite.
whats best ? nobody knows

 

[diskokobaja]

i will try it, i i will ask mitch from mephisto what cycle do they use...

 

[Nwtrading2012]

auto ak48( sagamartha seeds)
day 75 under 24/7 .

 

[GrowPotCheaply]

I've been using 18-6 for years. My auto Syrup yielded 7.9oz dry. It was only a three foot tall plant, but very big side nugs.

Not sure if 20-4 makes any difference. I haven't tried it that many times.

 

[bonghitter216]

Hi I am running a Mars hydro 192x3 led light and this will be my 1st auto grow and wanted to know should I run the light on veg only or should I turn on the bloom lights the full grow and info would be great thx

 

[F.N.]

I would because you are using very little hydro as it is and I am sure your plants in veg will get bigger than just running veg mode. I have never run a veg mode light and have grown some pretty big autos. And run 24/7 these plants do not need a rest IMO they need energy to grow and grow huge take care and good luck

 

[Terraformer33]

Wow lot of people voted on this. I think a dark cycle is important to plant biology circadian rhythm stuff. 3 hrs before and after midnight mimics summer conditions pretty good. I suppose a little more light wouldn't hurt if its cold out, but to save energy should go with less. It's definitely something that needs further study to scientifically deduce the best time. One day soon...
It can get 24hrs in the polar regions naturally anyways...

 

[F.N.]

24/7 does in no way adversely effect a auto plant IMO. I have never grown under any other regime and never will just one less thing to worry about. I have grown quite a few different strains too from different companies with no problems what so ever

 

[scally420]

Hi I am running a Mars hydro 192x3 led light and this will be my 1st auto grow and wanted to know should I run the light on veg only or should I turn on the bloom lights the full grow and info would be great thx

I have the 192x5 reflector and I have my autos under the veg lights the last 5 weeks and they are doing great,having the veg and bloom switch is the reason I bought the light!

 

[GrowPotCheaply]

Dutch Passion in their time lapse grows on Youtube, started with 20-4 about 3 years ago, then about 2 years ago, their last few were with 18-6. Those were their better yields.