How to choose daylight lamp? What is the light bulb specification?
Many people decorate in the sitting room, especially the lamp that chooses what type to choose, want to be able to match more comfortably in the home. This side of the hand is just arranged the basic specification of a fluorescent lamp tube, can serve as a reference, see to have no use. So what is a daylight lamp? How to choose? Note: under the warm prompt: fluorescent lamp structure and function: each has a filament on both ends of the fluorescent lamp, inside the tubes filled with tiny amounts of argon and the thin mercury vapor, tube coated with phosphor, on the wall between the two filament gas when conducting an ultraviolet, the fluorescent powder soft light.
The principle is: when the switch is switched on, the power voltage is passed through the ballast and the lamp filament to the two poles of the regenerator. The voltage of 220 volts immediately disassociates the noble gases of the regenerator, producing glow discharge. The heat of the glow discharge heats up the bimetal plates, and the poles are in contact. The current flows through the ballast, the regenerator, and the two ends of the filament. The filament is quickly heated by the current and emits a lot of electrons. At this point, the voltage between the poles is zero because the regenerator is closed, the glow discharge disappears and the temperature in the tube decreases. The bimetal strip is automatically reset and is disconnected. At the moment of the disconnection, the current of the circuit is suddenly cut off, and the ballast generates a large self-inductance, which is applied to both ends of the tube with the power supply voltage. The large amount of electrons emitted when the filament is heated, under high voltage at both ends of the lamp, is moving at maximum speed from low voltage to high potential end. In the process of accelerating motion, the argon molecules in the collision tube are rapidly ionized. Argon is ionized by heat, which causes mercury to produce steam, and the mercury vapor is ionized and emits a strong ultraviolet light. In ultraviolet light, the phosphor powder in the tube walls emits near-white visible light.
Electric fluorescent starter switch role in the circuit, it consists of a neon tube and a capacitance in parallel, and the role of the capacitor to eliminate the power supply of electromagnetic interference with ballast tank formation, and increase the voltage amplitude of the start pulse. An electrode in the discharge tube with double metal, use neon bulb discharge heating, make the bimetallic strip when open and close, inductance ballast current mutation on both ends of the tube and generate high voltage pulse. When the fluorescent lamp after access circuit, electric fluorescent starter began to glow discharge between two electrodes, the bimetallic strip heat expansion and contact with the static contact extremely, so the power supply, ballast, filament and electric fluorescent starter constitute a closed loop, current filament preheating, 1-3 seconds when the heating time, electric fluorescent starter of glow discharge between two electrodes, then the bimetallic strip cooling and static contact is extremely disconnected, when two electrodes disconnect instantly, the current in the circuit suddenly disappeared, so ballast produces a high voltage pulse, and it has to do with power superposition, on both ends of the tube and, make the inert gas ionization inside the tube caused by arc discharge, in the process of normal light, ballast self-induction is still stable circuit in current role.
Characteristics of the fluorescent lamp, lamp began to ignite need a high voltage, normal light allows only by small current, the voltage is lower than the voltage at the ends of the tube. On both ends of the fluorescent tube is equipped with a filament, the glass tube inner surface coated with a thin layer of phosphor, tube is pumped into the vacuum after the 10-3-10-4 mm hg, filled with a small amount of inert gas, at the same time also injection liquid water trace amounts of silver. Is a core inductance coil inductance ballast, the inductance of the nature is when the current in the coil change, will cause the change of the magnetic flux in coil, thus produce inductive electromotive force, the direction and the current in the opposite direction, thus hindering the current changes.
The fluorescent lamp shines after normal. Due to alternating current (ac) continuously through the ballast coil, the coil of self induction electromotive force, self inductance electromotive force blocking the current in the coil change, ballast step-down current-limiting role at this moment, the current is stable in the range of the rated current of the lamp tube on both ends of the voltage is stable within the rated voltage range. Because the voltage is lower than the ionization of the starter, so is no longer the starter in parallel at each end of the work, daylight lamp specifications: general search said 50 cm, 100 cm, 120 cm. Fluorescent lamp structure and function: each has a filament on both ends of the fluorescent lamp, inside the tubes filled with tiny amounts of argon and the thin mercury vapor, tube coated with phosphor, on the wall between the two filament gas when conducting an ultraviolet, the fluorescent powder soft light.
