What will be a good range in kelvins and lumens for just a couple plants?

I am going to be planting about 2 plants at a time and I'm not sure if I should order a fluorescent light by hydrofarm ( a agrosun full spectrum tube which is new) which comes with the fixture and 2 40W agrosun full spectrum tubes which produce 5850Kelvins and 2450 lumen output each. Will two of these be good for the vegetative stage? Or just one? I don't know much about the stages and what the difference is in kelvins and lumens during the diff stages? Can u give me the right amount of Watts , lumens, and kelvins for each stage? Thanks
 
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