Step 8: LED Lightbulb
With a box cutter, cut the thread off the mouth of the bottle, so that it is smooth.
Take an old incandescent light bulb and smash the bulb. Clean any glass off the screw-in part.
Cut a circle out of a piece of thin card (diameter should fit inside the plastic cone).
Pierce the card with however many holes needed to make the bulb you want. We made 12 VDC bulbs, because our lights run off DC. We made one bulb with 6 white LEDs (which is not very bright, but works for a lamp) and one with a mixture of several white and yellow LEDs. However many lights you want and whatever voltage you need, you will have to make the voltage regulator match.
You'll need a 12VDC voltage regulator, 6 white LED's and a resistor.
Solder your LEDs together, positive to negative. Solder the resistor to the negative end. Solder the ends of this array to the respective leads of the voltage regulator. On the input side for the voltage regulator, solder the positive to the tip of the light bulb base. The negative goes to the side of the screw in part of the light bulb. Glue the plastic bottle to the base.