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.
Electronic Ballasts are not. Electronic Ballasts are not the only thing that injects harmonics, besides, the level of harmonics injected is really small in the working ranges. The ranges where large amounts are injected is often in the bands which are not used in Industry and hence is largely undocumented.