4G technologies are designed to provide IP-based voice, data and multimedia streaming at speeds of at least 100 Mbit per second and up to as fast as 1 GBit per second. 4G LTE is one of several competing 4G standards along with Ultra Mobile Broadband (UMB) and WiMax (IEEE 802.16).
An electrical ballast is a device placed in line with the load to limit the amount of current in an electrical circuit. It may be a fixed or variable resistor.
Ballast Factor (BF) is a measurement that compares the ratio of light output of a lamp or lamps operated by a specific ballast to the light output of the same lamp or lamps operated by a standard reference ballast. The higher the BF is, the higher the wattage running through the ballast.