Fluorescent

LCD stands for liquid crystal display. LED means light emitting diode. Technically, both LCD TVs and LED TVs are actually liquid crystal displays. The same basic technology is used in both televisions. The main difference between the two is that LCD TVs use fluorescent lights (CCFL) for backlighting, while LED...

Devices that provide the appropriate voltage and current needed to operate gas-discharged lamps, such as fluorescent and HID, are called ballast. The ballast limits the current transmitted to the gas discharge lamps, thus preventing the lamp from deteriorating by attracting high current.