LED emergency drivers possess several crucial parameters. Firstly, the input voltage range is significant. It typically varies, for example, from 100V to 240V AC, enabling compatibility with different power supply systems in various regions and environments. The output voltage and current need to be precisely matched to the LED load. For common LED lamps, the output voltage might be in the range of 20V - 50V DC, with a current output of several hundred milliamperes to a few amperes, depending on the power and quantity of the LEDs. The power factor is another important aspect, with a higher power factor (usually above 0.9) indicating more efficient utilization of electrical energy and reduced harmonic distortion. The efficiency of the driver, often expressed as a percentage, should be as high as possible, commonly reaching 85% - 95% or even higher in advanced models. This helps to minimize power losses and heat generation. The standby power consumption is also a key parameter, as lower standby power (ideally less than 0.5W) is desired to meet energy-saving requirements. Additionally, parameters such as the operating temperature range (-20°C to +60°C or wider) and protection features like overvoltage, overcurrent, and short-circuit protection are essential to ensure the reliable and safe operation of the LED emergency lighting system.