I know this doesnt totally relate..but I thought it was interesting....
In my psychology class freshman year, they took a woman and put her in this bunker
like 1 mile under ground...no natural light, and not clocks anywhere...she was down
there for like 6 months. Her body eventually changed so that she was living on a 14
hour cycle....7 hours awake, floowed by 7 asleep....repeat....

so 2x6 may not be as unnatural as we think.... It may be a case of one is
better...but the other is whats really there...
I say, whatever works for you, keep doin it.

Rich

LeighMo wrote:

I don't know if I've ever heard a definitive answer for this. Some people
claim the split lighting prevents algae. Others claim plants do best with a
continuous, 12-hour "day."

Split lighting would be convenient for me, because I like the light on in the
morning, when I feed the fish before work, and in the evening, when I get home.
And it does get hot in the middle of the day in summer. However, it does seem
rather unnatural. For the fish, as well as the plants. I know I wouldn't be
happy with my day divided that way. So I'm sticking with 1x12, at least until
there's more info on this.

Leigh

http://www.fortunecity.com/lavender/halloween/881/