低亮度 meaning in English

low light
low-light level

Road danger lamps - specification for low - intensity battery - operated lamps
道路报警信号灯.第2部分:低亮度蓄电池灯规范
Function indicators . llluminates when activated functions are indicated
功能指示，当激活功能指示器时，会有低亮度照明。
Internal lighting ensures the display is optimally lit for a clear readout even in unfavourable lighting conditions . the buttons on the front are used for adjustment of the programmable parameters
内部灯光保证了显示屏具有最佳的照明效果，使得用户在低亮度条件下仍能够清楚地读取数值。前板上的按钮用于对可编程参数进行调节。