Light bulbs for Plant only tank

You can honestly use any, it really depends on the plants you want to keep. Many people use LEDs that have various coloration on their normal setting (so blue, green, red, and normal white LEDs on) to promote all colorations for plant growth.

Other times if you need high light, you can use ballasts since they promote far more PAR at a cheaper price but need to be replaced (the bulbs) once they die out.