I dont know about the light from first hand experience but it looks like a quality light. I was actually thinking about buying one myself. If the tank is that small I would definitly not go more than 70 watts. The 70 watt on that tank would be very high light and would let you get pretty much any plants you want. As far as the spectrum you would probably want a daylight bulb but I am probably not the best one to ask about that. Also if you are going to buy it, hellolights.com has it for cheaper and its a pretty good lighting website if you want to check it out.
Kevin
Kevin