But it's tough to use a dim screen in bright environments, so most phones offer an auto-brightness mode that automatically adjusts the screen's brightness based on ambient light.
The Tritium illuminates the aiming point in total darkness, and the fiber-optic self-adjusts reticle brightness during daylight according to ambient light conditions.
三重氢照明被用在完全黑暗状态，而视觉纤维（自动调节）用在白天或者可以说在有外界光线的情况下。
3
In order to meet the needs of special environment of the display, a display terminal brightness and ambient illumination mathematical relationship is established.