Opinions...120gal tank = MH bulb positioning

[Son Of Skyline]

What do you guys think? I'm going to be running 2 x 250w Iwasakis with 2 x 110w VHO actinics. Should I run the Iwasakis perpendicular or parallel to the front of the tank? I'm planning on buying reflectors in the next few days so I'm hoping that you can all guide me to make the right decisions [img]smile.gif[/img]

[Delphinus]

This tank has a 48"x24" footprint, no? I'd go perpendicular since you should have the room for this.

The lighting you describe, is what I have over my 75g. However since my footprint size is 48"x18" I don't have a lot of extra room so I have to run my lights parallel.

I beleive that the reflectors used for perpendicular mount, are more efficient, i.e., they have a much better spread of light and more light is directed downwards, etc., so if you can use those, go for it.