I am not sure what sort of light you have. The link on Amazon shows (for the same lamp/bulb) that it is a 65W bulb and a 30W bulb. In either case, you have far to little light.
IF this was my plant, I would do one of two things:
l. Cut the plant back to about 6" above the soil-line, water very lightly, and hope the plant to sprout from that cut section.
2. Toss the plant and just start all over.
You do need to do something about that lighting though. That bulb, regardless of wattage, might be fine near a very small plant, but not something like the size of your plant. Keep in mind that the lumens (light intensity) will be cut in half only 12" from that light bulb and at just 24", there won't be enough light for plants to grow much if any. If you have to use artificial light, is there a way for you to mount/hang a good florescent fixture? There are some great ones out there and they are not overly expensive.
Just as an example, I would guess that your lamp is producing around 1000 lumens at 1" from the bulb. At 12 " you are getting only 500 lumens. I have a six-bulb florescent fixture (T5HO) that produces 30,000 lumens at 1". At 12", my fixture produces 20,000 lumens! If that doesn't get your attention, the florescent bulbs can last 5-10 times longer than your incandescent one and since much less wattage is necessary to produce the same amount of lumens with a florescent bulb, you can cut your electrical bill by up to 75% switching from incandescent to florescent.
