Howdy,
I had an Echinodorus and Cryptocorynes in a starter 10 gal with just an incandescent bulb, and they survived very well. One could even say the Crypts liked it. The sword grew, but only enough to maintain total biomass. But there are only very few plants (like the ones I mentioned) who can be kept with incandescent bulbs for extended periods of time.
HarleyK