Lighting question

[nmarc3627]

I am going to take a stab at growing live plants again and I need to know where I can find a 24" 40 watt flourescent light fixture online. I have visited lots of sites and they don't make a 24" 40 watt fixture. The 24" ones with two tubes don't give a wattage amount on them so I am clueless. The pet stores where I am are usless so I must rely on internet stores. I am also assuming I need a spectrum of about 600-700 nm. Also, I have regular plain old sand. Can anyone give me some advice of what good plant growing substrate I can add to it. Thanks