I'd go do that right now, ASAP. You can't grow plants with incandescent light. White light is rated according to Kelvin, which denotes it's color temperature. 2000-3000k is an orangeish hue that is best for flowering, budding plants. When your plants are in veg state they mainly use blue light, which is found in the 5000-6000k range on up, I've seen as high as 20,000k. Go get a LED or CFL replacement bulb at whatever the appropriate wattage is or else your plants will be falling over by tommorow, probably.