Look at the packaging on your lights; or if you've already thrown the packaging out, look at what is printed on the base of the light. You want to see what the K rating
is on the bulb.
5500K - 10,000K is the range you are looking for. Most people peg the ideal rating as around 6500K but anything in the range is going to be fine for growing plants. Usually bulbs in this range are called "daylight" bulbs (or sometimes "sunlight" bulbs) but you can't trust a name alone, as different companies will use differing names for different K
values; there is no common standard that they are all forced to comply with.
The ones to avoid are the "soft white" bulbs, as those usually have K
ratings way down around 2700K or something like that, which definitely will NOT be helpful in growing plants.
I have three planted tanks that use 6500K spiral CF
bulbs and plants grow great in all three of them.