How Long should I run my Metal Halides Each Day?

[waterflash]

Hi All
I Have a 6x2x2 tank that has 3 150w, 6500kelvin metal halides. I am hoping someone can give me some idea about how long they should run each day.

Cheers

Robin

[StonX]

I would have them on about 6 /day gradually.

eg. MH 1, 6 hrs; MH 2 & 3 - 4hrs.

Is that a MH kit you've got with T5 globe option? if thats the one, I'll turn on the globe 1/2 hrs before the 1st MH start & off 1/2 hrs after so it doesn't freak out the fish.

Other member might have other idea but thats how I run mine. Co2 & right fertilisation is a must if you are running MH