0seandogue 10 years ago I would be inclined to say that ALL plants want darkness for a period of time every single day. This is when they breathe and repair. That isn't a philosophical comment either. it's a page from lessons learned in botany during college and originally fronted by my 7th grade science teacher about 35 years ago. (she did a good job, btw, I remember most of what I leanred in her class)In fact, I don't know of any plants that would not benefit from a daily period in which they can rest, repair, and breathe and would be interested to know the names of those that want 24hour light..The way I learned to grow indoors is that a 4:3 light/dark ratio is about right for heavy growth in tropicals, a bit less for those that come from the temperate regions. Mimicking growth cycles gets a bit more complex, but it's basically just a ramp up of the light-to-dark ratio followed by a ramp down, for instance, for indoor erm vegetable production.