LED light engine (light engine) means includes an LED package (module) or LED arrays (modules), LED drivers, and overall combination with other brightness, thermal, mechanical and electrical components. The device to be connected via a conventional LED lighting matches to connect directly to the branch circuit, the LED lamps designed not to use the standard holder.

Is not the entire LED lamps can also be called a light engine it? Mao pointed out in the sea, of course not. Just like the whole car can not be called the engine, the engine is the car's powertrain, but it does not mean the car, plus the shell in order to become a car. The need for such a product light engine, because all the lamps have a variety of appearance. Some lamps may even be called art.

Take the incandescent lamp, it can be said that it is only the simplest form of the bulb, at most, plus the candle lights or tiny Christmas lights. But its appearance, but there are a wide variety of. Especially Crystal Light is a wide variety of arts and crafts, extremely gorgeous. However, you must also add extremely complex LED constant current source to drive the same as the equivalent of an incandescent work (can be connected to the 220V light). If the LED light engine to make it like incandescent lights can be connected to the 220V (of course also need to have their match in the radiator). Thus on the one hand help to standardize, it can also greatly facilitate the housing (and radiator) designers to play their best.

LED light engines interpret technical difficulties

The drive to achieve constant current source LED panel lights go first difficulty is not enough space.

With bulb, for example: if the general switch current source LED aluminum panel into a total of more than 30 components, of which there are large inductors, transformers and large capacitors, components will block light, the more components, Reliability worse. Thus, switching constant current source is not available.

In this case, can be solved by linear constant current power supply.

But Mao Yu Hai said, using ordinary linear constant current source is not a viable light engine program. While it solves the problem space can be linear current source inefficient, especially when less efficient at high mains, in addition, heat.

While in power regardless of where its heat is always scattered through the radiator to the space, but when the power supply and the light board, when put together, the power consumed by the power supply will be added directly into heat and light board on will increase the light board needed to disperse the heat, which would increase the LED junction temperature, reducing its life.

It also extended a light engine second technical difficulty - cooling.

10-watt LED bulb, for example, assume that the power efficiency of 85% (linear constant current source mains voltage, the lower efficiency), which is the driving power of 8.5 watts of LED power itself power consumption of 1.5 watts.

Assuming LED luminous efficiency of 30%, which is 70% of the power required to dissipate into heat. Now coupled with the power of 1.5w, becomes 7.8W of power, will increase the heat 19.2. This power supply is integrated into the aluminum plate will make the LED junction temperature has increased by 15.8% (as a part of scattered to the radiator). Assumes that the original LED junction temperature is 85 ℃, and now LED junction temperature will increase to 98.4 ℃, which will reduce the life of the LED.

In this case, only the high-efficiency linear constant current source to achieve optical engine, it has the advantage of high efficiency and light efficiency of stationarity. Reducing the overall heating efficiency drive