Abstract: A toroid-free ballast comprising a filter and rectifier circuit (10) coupled with an AC power, a switch and resonant circuit (20) coupled with the filter and rectifier circuit (10), characterized in that, the switch and rectifier circuit (20) comprises a half bridge oscillating circuit composed of two transistors. The present invention has the benefits of being toroid-free, as well as being relatively compact in configuration, low in cost and favourable for the miniaturization of the electronic ballast.

Abstract: A light control circuit for use in light control fluorescent lamps comprises a filter and rectifier circuit (1), a frequency control and resonant circuit (2) and an ambient brightness signal sampling and control circuit (4); wherein the ambient brightness signal sampling and control circuit (4) advantageously adopts an integrated circuit (U1) to control or adjust light sensitivity of the light control circuit in an accurate manner and to control the onoff of the light control circuit in an intelligent way such that the output of the light control circuit is not susceptible to a sudden change of the ambient brightness.

Abstract: A safety lampholder is disclosed, comprising an insulating housing; an insulating or electrically conductive lamp socket placed within one end of the housing; an electrically shockproof means fully integrated within another end of the housing, wherein the shockproof means comprises two electrical connectors electrically coupled to a power supply; two electrical contactors in direct contact with a lamp body engagable with the lamp socket; a spring member fixed into the shockproof means; and a switching member having a lower part, an upper part which protrudes beyond a horizontal surface where at least one of the electrical contactors is located, and at least one protrusion with at least one side surface in slidable contact with one of the electrical contactors; and wherein the electrical contactors, electrical connectors and switching member are disposed in a spaced manner. A method for avoiding accidental electric shock during use of a lampholder is also disclosed.

Abstract: A light control circuit for use in light control fluorescent lamps comprises a filter and rectifier circuit (1), a frequency control and resonant circuit (2) and an ambient brightness signal sampling and control circuit (4); wherein the ambient brightness signal sampling and control circuit (4) advantageously adopts an integrated circuit (IC2) to control or adjust light sensitivity of the light control circuit in an accurate manner and to control the on/off status of the light control circuit in an intelligent way such that the output of the light control circuit is not susceptible to a sudden change of the ambient brightness.

Abstract: A safety lampholder is disclosed, comprising an insulating housing; an insulating or electrically conductive lamp socket placed within one end of the housing; an electrically shockproof means fully integrated within another end of the housing, wherein the shockproof means comprises two electrical connectors electrically coupled to a power supply; two electrical contactors in direct contact with a lamp body engagable with the lamp socket; a spring member fixed into the shockproof means; and a switching member having a lower part, an upper part which protrudes beyond a horizontal surface where at least one of the electrical contactors is located, and at least one protrusion with at least one side surface in slidable contact with one of the electrical contactors; and wherein the electrical contactors, electrical connectors and switching member are disposed in a spaced manner. A method for avoiding accidental electric shock during use of a lampholder is also disclosed.