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We would like to thank all of our sponsors, including:
How long is your photoperiod?
How long is too long?
How long is too short?
Would having too short lead to brown corals?
Roberto
Fremont, CA
Illuminata 57
I'm NOT an expert, but I keep my total light time at about 9-10 hours for the "sunrise / sunset" lights and about 6 hours for the MH / primary lighting. No idea if that is right, just what I have always done. 
Usually 5-7 with halides. Lomger with dimmable LEDs, but a lot of it is pretty dim
I think I have 6 hours or so with halides, then 10 hours with T5s...
If I was running LEDs, probably 6-7 hours with whites, then 12 with blues.
-Mike 
3 hrs on my single Kessil, then 4.5 on my halides, back to 2.5 on the led. I've shortened my halide duration a half hour recently but who knows???
Odd man out running plasmas, but I run a 90 minute ramp up sunrise, 9 hours on, then 90 minute dimming sunset- total 12 hours on time.
bumped up to 7 hours MH. Used to run at 5 hours when I also ran PC's before and after. Now its on for 7 and no longer.
I am running 4 tube T5 HO in two zones. Blue zone is on 8.5 hours a day and white zone is 6 hours through mid-day. This time of year (low sun angle) my tank gets mild afternoon sun which spurs algae growth so I cut back white light by 30 minutes. White light favours algae, blue light favours coral.
Mmmm plasma. Anything new in plasma? This reefbuilders post is the one everyone points to but it's now a couple of years old. Any reviews of plasma that celebrate or condemn it's performance for reef aquaria?
Mmmm plasma. Anything new in plasma? This reefbuilders post is the one everyone points to but it's now a couple of years old. Any reviews of plasma that celebrate or condemn it's performance for reef aquaria?
To chase this thread off topic - not much out there on plasmas in the media. Guess my build thread is the longest running celebration of plasmas for what that is worth (I know it needs some updates)! Not very many of us running plasmas - mine have been up for 18 months and I love 'em. Not much info out there, I'm thinking LEDs are using up most of the oxygen in the lighting world. I just set up a 100G frag tank with a single plasma and hope to document frag growth once it is settled in and running (just getting through the cycle right now).
Heh... I'm fine with my photoperiod, thank you 
Isn't that a little personal?
jk. I'm currently photoperiodless and didn't want to feel left out.
Levi
Pittsburg, CA