What is T4 lamp

T4 tube

T4 tube

The T4 lamp is a fluorescent lamp (or fluorescent lamp, light tube, fluorescent tube), each T is 1/8 inch, T4 diameter is 4/8 inch, about 12.7mm
T-tube, tubular luminaire, is an ordinary fluorescent tube,
Beside this there is:
T12 diameter 38.1 mm
T10 diameter 31.8 mm
T8 diameter 25.4mm
T5 diameter 16 mm
T3.5 diameter 11.1 mm
T2 diameter 6.4 mm Advantages In theory, the finer the lamp efficiency, the more luminescence the same wattage.
However, the more delicate the lamp is, the more difficult it is to start. Therefore, when it comes to the T5 lamp, it must be started with an electronic ballast.
In order to save costs, T5 and T4 are sold in the form of miniature brackets. Ballasts are contained in the micro space of the bracket. The efficiency and quality of such ballasts are generally not good, resulting in lamps that should be highly efficient. Instead of the conventional T8 lamp, the life is also a little discounted. In spite of this, the temptation of the thin tube is still great, and the sales volume of the T5 and T4 lamps is getting larger and larger. However, the latest led flexible lamp strips are superior to fluorescent lamps in many respects and have a great potential to replace them.
Edit this paragraph working principle

The internal structure of the fluorescent tube is filled with low-pressure argon or argon-helium mixed gas and mercury vapor, and on the inner surface of the glass fluorescent tube, a layer of phosphorescent fluorescent paint is applied, and the two ends of the lamp tube are made of tungsten. Filament coil. When the power is turned on, first the current is heated through the filament and the electrons are released. The electrons turn the gas in the tube into a plasma and increase the current in the tube. When the voltage between the two groups of filaments exceeds a certain value, the lamp starts to generate light. The discharge causes the mercury vapor to emit ultraviolet rays at wavelengths of 253.7 nm and 185 nm. The phosphor fluorescent paint on the inner surface of the fluorescent tube absorbs ultraviolet rays and releases longer wavelength visible light. The color of the emitted light is controlled by the ratio of the phosphorous components, while the glass tube prevents harmful UV rays and other harmful substances such as mercury from leaking out. There is a positive feedback relationship between the discharge current of the fluorescent tube and the on-resistance of the operating mode : when more current flows into the fluorescent tube, more gas is ionized, so that the on-resistance in the tube continuously decreases, so that it will make more More current into the fluorescent tube. If the fluorescent tube is directly connected to a fixed voltage source, the fluorescent tube will be quickly burned due to the continuous rise of the current, so an auxiliary circuit is required to control the current entering the fluorescent tube at a fixed level, and this current control circuit is usually Called a ballast. The ballast is actually an inductor. When the on-resistance drops to a very low value, the ballast's fixed inductive reactance and copper consumption make the on-current approximately equal to the constant value and begin stable operation. Traditional ballasts require a small component called a starter (commonly known as “Stata”) to make the difference in voltage between the filaments to the extent that the fluorescent tube is sufficiently discharged. The latest electronic ballasts are not A starter is needed because the start-up work is already included in the ballast.

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Led fluorescent tube is also commonly known as light tube, LED lamp, the light source using LED as a light. Traditional fluorescent tubes, also known as fluorescent lamps, have a filament on both ends of the lamp. The lamp tube is filled with traces of argon and thin mercury vapor. The fluorescent lamp is coated on the inner wall of the lamp. When the gas between the two filaments is conducting, it emits ultraviolet rays. Causes the phosphor to emit visible light. Led tube has many advantages, generally used for general lighting, office buildings, shopping malls, restaurants, schools, homes, factories and other indoor lighting. With the small series to see the price of led fluorescent tube and how to buy led fluorescent tube.

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