One quick hps light question.

Joker941

Joker941

Active Member
Hey guys..
first attempt indoors but i would like to know a good light cycle for the vegetative stage from germination to the blooming stage which is 12/12. What would the appropriate lighting be fore indoors hps light? 20/4?

thanks for the help guys.
 
moses224

moses224

Active Member
I have done 18/4 and 24/0 same plants same period different rooms. 24 definately grew faster. I always veg 24/0 for first 20 days then switch to flower. just my 2 cents
 
MJ Crescendo

MJ Crescendo

Well-Known Member
I have never heard about light limitations either. I've always assumed long as they are getting light they are growing. I'm for 24/0 to just get them started (2-3 weeks) then properly flowering them. 12/12 8-12 weeks.
 
MrFishy

MrFishy

Well-Known Member
I've been doing 24/0 for 31 years? That's a whole lot of wasted power if this is a scientific surety.
 
Lokes

Lokes

Active Member
MrFishy said:
Could you possibly cite a source for this claim? Thanks.

I've never heard this before.
Click to expand...
MrFishy per Gardening Indoors by George Van Patten he states,"Most mature plants can process only 16-18hrs of light per day efficiently. After that, a point of diminishing returns is reached and the electricity is used inefficiently. I advise to turn light off after 18hrs and give all plants at least 6hrs of darkness."

..he also briefly mentions this light cycle which would be a good experiment.

"Experiments with short-day plants show that if the light is turned off for 6hrs and on for 12hrs, plants can actually live a faster life. That is, a short day plant can actually live a 24hr day in 18hrs. But this bit of trivia is more scientific jousting than practical application, and no electricity is saved."
 
MrFishy

MrFishy

Well-Known Member
Lokes said:
MrFishy per Gardening Indoors by George Van Patten he states,"Most mature plants can process only 16-18hrs of light per day efficiently.
Click to expand...
Thanks Lokes. Interesting.
The word 'mature' is important to this discussion.

All in all, lots of hours of light during veg will cut down on overall veg time and get you to 12/12 faster.
On this I believe we can all agree.
 
benzo

benzo

Well-Known Member
anothor method is start 24/0=3weeks then 18/6 when ur ready for bud 12/12 that sucker
 
tusseltussel

tusseltussel

Well-Known Member
limitations on light are not by hours but by lumens, light 24/0 not a waste having mor than about 7,000 lumens per sq ft is a waste of electricity, the sun puts out like 10,000 on a clear day in direct sunlight:peace:
 
Lokes

Lokes

Active Member
I think its good for plants to have down time just like every bio organism. That's when allot of repair takes place and allows other process the plant utilizes to work; such as CO2 and O2 processes actually reverse at night to cleanse the plant.

I like benzo's method also, using 24hr, then 18hr, which allows for a good start and then gives time for plants to do there thing repairing during dark hrs.
 
MJ Crescendo

MJ Crescendo

Well-Known Member
Well from this threads inspiration I am thinking I will try 1 1/2 weeks of 24/0 then switch to 18/6 for another 1 1/2 weeks. After 3 weeks of veg, time to switch to my favorite time, flowering!
 
You must log in or register to reply here.
Top