The LED fluorescent lamp adopts CREE and AOD super bright LED white light as the light source, and the outer casing is acrylic/aluminum alloy (customer defined). The cover can be made of PC tube and has a high temperature resistance of 135 degrees. LED fluorescent lamps and traditional fluorescent lamps are the same in size and size. They are 60cm, 120cm and 150cm in length, and their power is 10W, 16W and 20W respectively. The actual power consumption of 20W traditional fluorescent lamps (inductive ballasts) is about 53W. The 40W traditional fluorescent lamp (inductive ballast) actually consumes about 68W.
At present, almost all of the LED fluorescent lamps on the market are built-in. The so-called built-in means that the power supply can be placed inside the lamp. The biggest advantage of this built-in type is that it can be used to directly replace existing fluorescent tubes without any modification to the original circuit. Therefore, the shape of the built-in power supply is usually made into a strip shape so as to be inserted into a semicircular tube. There are two types of built-in power supplies, one is non-isolated (Figure 1) and the other is isolated (Figure 2).
Non-isolated means that there is a direct connection between the LED load terminal and the 220V input terminal, so there is a danger of electric shock due to the touch load. There is only a very thin insulation layer of the aluminum substrate between the 220V and the aluminum case, which is usually not easily CE and UL certified.
Isolated means that there is isolation transformer isolation at the input and output. This transformer may be either power frequency or high frequency. But both can isolate the input and output. You can avoid the risk of electric shock. It is also easy to pass CE or UL certification.
First, the power consumption of the built-in power LED fluorescent lamp
The biggest advantage of using a built-in power supply is that it can directly replace existing fluorescent lamps without any changes to the original wiring. So is this built-in advantage also cost a certain price? This is true, and the price is not small. This starts with the ballast structure of ordinary fluorescent lamps:
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