i find that the bulbs with a slight blue tinge look nice, but if u get any new bulbs and the light strip is the original that came with the tank it most likely cant support many watts, so make sure u get a light bulb that is not too powerful for the light strip

it usually says on the back how much it will support. For example my light strip on my 46 gallon cant do more than 40 watts, and 20 watts on my 125 gallon, etc.
if u want plants i suggest u buy a new lightstrip too, but they can be quite pricey, here's the ones i will probably get
http://www.aquatraders.com/index.asp?PageA...&ProdID=3102 of these for my 125 gallon because these are really cheap and good enough for the plants im keeping
try checking that site, they have some great deals and lots of sales right now