Quote Originally Posted by whisky
the color should be white cfl for veg, the red one stimulates stem growth vs foliage which is bad. yes 18/6 is better, plants get a rest and shoot up the next day and grow faster. 24H isnt good and it makes more males also.
And not to be a nay-sayer. But under 24/7 light, i ended up with 6 fems out of 8 plants. Two of the males were stressed beyond belief before they ended up that way too.

The root growth is something to consider, but 24/7 is my favorite bet if you dont have to worry about heat, or other issues resulting form lights being on all day.