I have them under a 70W Sodium... They seem fairly happy... They seem to be growing faster over the course of the past few days.... But is it safe long term leaving them under 24 hour light?

Plants can be grown with 24h light for awhile...but in the long run it really is better to give them a 'rest period' ie: a night.

Lol thanks..... They've since been moved back into the sun since the clouds have lifted but this into I'd still good to know...

People grow sunflowers here where it doesn't get dark at night.

People grow sunflowers here where it doesn't get dark at night.

I thing the half year night has not much sun...
And the other half year you have any night at all?
:-)

But I don't thing there is enough sun to grow any more than just barely at all...

People grow sunflowers here where it doesn't get dark at night.

Mann I would enjoy a long night that lasted days or Months, but a day that lasts days or months.... No thankyou lol...