Why would you complicate it like that? :lol: That's a lot of messing around with timers! For lights, I just use the cheap $8 timers that have those little tabs that you move around. So to move a tab over a half hour takes a whopping 3 seconds. To mess around with several on/off settings in a day would be a pain in the butt. Doesn't really matter how you do it though.

What kind of corals do you have? You probably don't have to take 5 weeks to make the switch.

dimmable LED, reefkeeper elite with ALC and lunar similation pods

blues 11 am to 10 pm
whites 12:30 pm to 8:30 pm

I am using 15min tab timers , it is not that hard to configure the time for that, I really dont want to bleach any of LPSs

This is mt tank :

http://i735.photobucket.com/albums/w...ys_Version.jpg

Rose BTA , Green BTA, Elegance , Torch , Hammer , Frogspawn, Zoa, Mushrooms , Ricordia , Lobo ,
Mostly LPS and soft corals .

Current lighting is : 2x 55w 50/50 10,000k T5 + 2 x 18w Actinic T5 = 146W new one is :
New Lighting systems is : 1x 250W DE HQI Bulb 15000K 4x 24W T5 Actinic Blue = 346W!

it is more than double that's why I am really worried about this change

You can control the intensity by adjusting height instead of time, put you lights up on blocks and slowly lower it down to your tank. The on/off on the halides are generally not good. Not saying that you're going to break it, just shorten life (the amount for 5 weeks might be so little that it's not worth worrying about)

Mine is like so:

Actinics: 10am-11pm
"Whites": 11am-10pm
Moonlights: 11pm-6am

Now, if it weren't for the fridays, saturdays and sunday when we're all home, I'd fire everything up a little later, but I like to go down and tinker in the mornings on the weekends. (My wife calls it obsessing... lol)

Oh ,So you have your moonlights ON all night

Yup. funny thing about the world... the moon is out all night... and the SUN IS ON ALL DAY.

I like that ,but I thought the fishes dont like it