Good move man, you won't want to use a 14K bulb for a planted tank. 10K would work, or if possible, somewhere in the 6700K range would be good (not sure if you can buy halide bulbs in that spectrum).
Yeah the only bad part is the heat coming from it. If I can find a nice 12 inch t5 fixture I might go with that. I hate going from a nice 20k radium bulb to a 6700k bulb. :headshake2: