Runs on less power, 1.5 volt/180 mA, than most joule ringer lamps. No high power rheostat to burn out like other variants. Small hand wound transformer. small AAA battery, 2N2222a. No high voltage produced that would be a safety concern. great for emergencies and a good science fair project. Uses off the shelf led bulb, not disassembled like some other projects.
see how to make the latest version.