Use a drill press to hollow out the candle. Drill 10 inches in, leaving only half an inch on the sides of the candle.
Connect a six volt LED control module to a mini six volt battery. The control module should come with a remote so it can be turned on and off easily. The module acts as a switch.
Attach a six volt LED or LED light cluster to the control module. The exact method of attachment will vary, depending on the LED module that you use. However, it should be a very straightforward process. The LED will have two connector wires--one positive and one negative. Plug them into the positive and negative terminals on the control module.
Insert the battery, control module and LED light into the hollowed out candle in that order, with the lights on the top.
Use the control module remote to turn on the LED candle.