Check for a daylight 6500K or 6700K Spiral CFL. I can't find them around me almost anywhere, but other people report the find them all over the place.
http://www.acehardware.com/product/index.jsp?productId=2903524
That is the 100W, depending on how far away from the light it is and if it shoots all the light straight down or half goes up through, say a lamp shade. You may not need it that bright.
Mine came from Ace hardware, and not all of the daylight ones are the same Kelvin / K rating.
Also saw a plant grade light bulb a Walmart in their pet/ fish /aquarium bulbs.
And Zoo Med has one that is called Ultrasun.
6500 K daylight self ballasted compact fluorescent lamp
Ideal for all freshwater, marine, and reef tanks
Excellent color rendition for optimum viewing
Promotes photosynthetic processes in plants/marine algae
Fits standard medium base
All good for growing plants!