I would skip the LED's and go with CFL's. Regular LED's don't have the right color spectrum for plants - LED's used for plants are colorful and hard to live with as lighting for your house.
The attached article suggests using a combination of CFL's and incandescent lights in gooseneck lamps:
"Easy plant lighting for room with low natural light:
Find a standing lamp with three bulbs, ideally one with moveable or gooseneck fixtures.
Use one incandescent bulb and two compact fluorescent bulbs of the highest wattage you can, within the safe wattage rating for the fixture.
Aim the lights toward your plant table. If each fixture is separately movable, then put the fluorescent bulbs closer than the incandescent, to avoid heat damage.
Place a mirror or other reflective surface underneath your plants, to reflect light back up onto the foliage.
Attach a timer set to 16 hours per day."