1. Reliability and service life
2. Efficiency/lumen per watt
Compared with the standard incandescent lamp, led consumes per unit of power to produce more light output. But compared with the halogen lamp, the LED's actual light output advantage is not obvious. The newest LEDs have excellent lumens per watt values, but some of the values are obtained under optimum conditions, usually not under the highest output conditions. In general, when the LED current increases, the output of light does not increase linearly. Therefore, even if the LED is output x lumens under 0.5A Current, it will not output 2x lumens at 1.0A current.
3. Response Speed
With the brake lamp and directional indicator tubes For example, assuming that the vehicle speed of 125 km/h, that is, 35 m/s, incandescent lamp thermal start-up time is about 250 milliseconds, and the rapid reaction of LED can be about 8 meters away from the brake warning, so as to effectively avoid car collision. The same is true of LEDs.
Another key feature is the LED glow. Unlike incandescent lamps, led only through a surface glow, this head lamp and chart lamp application is beneficial, but may not be suitable for carriage lighting other lighting applications.