Light structure reccomendations?

Currently I am running stock lights on my long aquarium (48in).

I am getting a really low wattage from the lights I have now. It seems as though I have 36 total watts output right now on a 50 gallon tank. I heard somewhere that you need at least 2 watts per gallon to grow most plants. Many of my plants have withered away already.

:grin2:TIME TO UPGRADE!:grin2:

Any reccomendations? I suppose, doing the math, I will need at least 100 watts glaring down on this baby. Is that all I have to search for while buying?

I posted this before and got people reccomending LED over t-8? Any reccomendations for specific builds?

Bump: http://www.petmountain.com/product/aquarium-t5-light-fixtures/11442-522693/coralife-coralife-aqualight-high-output-t5-dual-lamp-fixture.html?utm_source=googleproductads&utm_medium=cpc&gclid=CJPX-baBiNACFc1ZhgodFuEAAw


Would these do the trick? I want to grow a jungle!

Bump: http://www.petmountain.com/product/aquarium-t5-light-fixtures/11442-522693/coralife-coralife-aqualight-high-output-t5-dual-lamp-fixture.html?utm_source=googleproductads&utm_medium=cpc&gclid=CJPX-baBiNACFc1ZhgodFuEAAw

Would these do the trick? I want to grow a jungle!