Ai vega vs Ai sol vs Ai hydra

[Glitchfish]

Hellow everyone, i wonder if you can all help me! I am going to be setting up my fluval sea m90 next year and I am just curious about the ai range of lighting! What i want to know is which one is the best, and is there a way to mount them landscape over the aquarium instead of portrait! (like this --- instead of this |) Also how many would I need over my 3ft tank!

Thankyou for your attention

 

[Greenstreet.1]

http://i1298.photobucket.com/albums...B-10EF-42BD-8A2D-7B5D7037BD2F_zpsguxs2kqo.jpg

This is what I did with my sol Blues but I am thinking of buy 52's upgrade kit and do an upgrade.

 

[Glitchfish]

Wait so you can upgrade from the sols to the hydras? How much will it cost xD probably like £200 a bulb xD