I haven't heard this from anyone before. I use 24/0i've heard from several sources that 24 hour light increases your chances of growing males and hermies.
werd. its a waste of electricityi really dont like to veg my plants with 24 hours of light... they grow when the light is off.. plats collect the energy during the light cycle and assimilate it and use it when the light is off.. it obviously works to veg them with the light on all the time.. but i believe it is better to just root cuttings under 24 hours of light but to switch to 18 hours on 6 hours off for a good veg..... it will not grow faster with the light on 24 hours a day.......