CLONING--- how long to keep lights on?? 24/7? 18/6

hi i was wondering when i start cloning, how long to i keep the lights on? 24/7? 18/6? thanks for any advice. take care

I have read in hightimes Q&A that plants will not photosynthisize more than 18 hrs a day... I have also heard from local experienced growers that by keeping the lights on 22-24 hrs a day you prevent stretch(distance between nodes or leafsets)...that said... I personnally go 20 on 4 off...for no other good reason than to give time for the lights to coo and give em a break..... about all I got...peace

I leave my fluoros on all the time (6 total). MY other mercury vapor light is on a 18/6 schedule.

my schedule for rooting clones, 24/0
vegging, 20/4
flowering, 12/12

hi .. i like clones at 18/6 limits streatching which happens as soon as they hit
regular air and light.....( this can also be stopped using a b 12 solution with a very dilluted BUd solution 1/2 strength )
always imhop.. keeps....

Every drop of light your clone recieves, it must process it. That means sucking water/nutes through its stump. For more success you should go to 16-18Hrs light.
More light = less leftover energy for root formation.