The Bulbs they are suggesting say they are as close to natural sunlight as any fluorescent... not true. Light is a sticky subject, there are different things that you need to keep in mind. Colour temperature or Kelvin (K), i believe 6500k is considered full spectrum (good). The amount of light output in lumens or foot candles and this will depend on the plants needs, hight, mid or low. Since the bulb is not too far away from the plants you may be able to get away with t12 full spectrum bulbs. t12 are probably the bulbs you would be most familiar with, t8 bulbs look the same only thinner but actually give more light and lastly t5 are super skinny high output bulbs that would require a different ballast (so you dont need to worry about them
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