1, LED lights constant current power supply Why must it?
Characteristics of LED lighting of the material determines its influenced by the environment, such as elevated temperature, LED current increases, the voltage increases, the LED current will increase. Long-term than the rated current work, will greatly shorten the LED lamp beads life. The LED is constant during temperature changes and environmental factors such as voltage, current work to ensure that their value remains unchanged.
2, LED lamp power constant current accuracy
Some current precision on the market power of the poor, as the popularity of the programs recommended by the constant current programs, error of ± 8%, constant error is too large. General requirements ± 3% on it. 3% of the design. To fine-tune the production of power in order to achieve ± 3% error.
3, LED street lamp power supply operating voltage
General LED recommended operating voltage is 3.0-3.5V, tested, most of the work in 3.2V, 3.2V calculated according to the formula so reasonable. N light bead in series the total voltage = 3.2 * N