Adding more ligth

[Z Trip]

Hello everyone, I have a 55 gallon tank with duel T5 HO lamps growing my plants. Now everything seems to be ok so far.

What I want to do is make my 80g into the planted tank. Now I'm figuring I need more ligth, but I want to know whats the best way how.

Rigth now I'm using this on my tank :

http://ebay.f3images.com/IMD/feeds/AK01145_50.jpg

It has a 6000k and a Roseate bulb.

I don't know if I should get another of the same or try something different such as:

http://www.petsandponds.com/en/aquarium-supplies/c5813/c293075/p16873717.html

OR

http://www.petsandponds.com/en/aquarium-supplies/c5813/c293075/p17552492.html

What do you guys think? Is what I need can be found on that website? (I do my ordering from their)

Thanks again.