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1 LED light-emitting properties of new technology allows LED current to achieve high power levels,[link widoczny dla zalogowanych], LED power to achieve 1W, and even some to 5W, luminous efficiency to achieve 60-85LM / W,[link widoczny dla zalogowanych], this device is called bright LED LED ( HB-LED). Currently we are using LED lighting on the HB-LED, the LED 1W generally choose the way through the series and parallel composition of high-power LED lights, especially the main series. This LED for 3.4V ± 2%, a forward current of 350mA or so.
The - curve shown in Figure 1.1. Figure 1.1 LED? Curve can be seen from Figure 1 that, when added to the voltage across the LED does not meet 3.4V before, with the increase. When added to the LED when the voltage reaches 3.4V, the change is small, increasing the voltage across the LED will only increase the current flowing through the LED, thus changing the LED brightness,[link widoczny dla zalogowanych], LED increased until the maximum (350MA), LED to achieve maximum brightness. Which has been clamped in (3.4V) or so.
And the LED with temperature and hours of work change, change curve shown in Figure 1.2. Figure 1.2 The relative change of the temperature curve can be seen from Figure 1.2, with the temperature rise will gradually become smaller, on the contrary, when the temperature decreases, will increase. When the LED's temperature rose to 85 degrees,[link widoczny dla zalogowanych], has become a 3.25V (3.4V-0.15V), the opposite when the temperature dropped to -40 degrees LED becomes 3.6V (3.4V +0.2 V).
Therefore, LED dimming, to get transferred to a fixed brightness LED, it is necessary to ensure a fixed, constant current control to be used is to say.