Quote Originally Posted by privatepile
Just to get back on topic i am growing 2 white widow plants.Its a very basic set up.A cupboard with 3x20watt CFLs(100watt equiv)

At the moment they are 6 days old.I have them on a 18/6 light cycle..Could i switch over to a 24hour light cycle? and would it do any damage.

I will flower using 2x20watt CFls and 2x125watt envirolites.
No, it wouldn't do any "damage" so to speak.

What it WILL do however, is cause your environment to require more CO2, more abundant water in the soil and better nutrients in the soil.

Now will your plant die if you cannot compensate? Short answer is no.

Long answer is it would be completely pointless to switch to a 24hr light cycle if you're not going to utilize the extra light. The more light you have the faster the plant will want to grow. To utilize this properly you have to compensate.

Now given the fact that you're operating on a low wattage light setup you may not have to compensate at all for the extra light.

All in all longer light periods are generally beneficial for fuller growth. Just keep an eye on your basic elements and adjust accordingly. Usually the biggest thing is CO2 and water. If your plant/s start wilting, turning color, drooping or showing signs of stress in any way after changing the light cycle try adding water as your first resort. (check the soil of course)

If water isn't the issue then CO2 is your next bet. Chances are the extra light is actually choking your plant. Being in such a small area with unnatural air-flow and abnormal levels of CO2 this is a serious issue and is over looked a lot by new growers.

Goodluck with the 24hr cycle.

PS- I personally don't reccommend it.