ambient light
Technical term in computing and imaging for the general light present in an environment, as opposed to light from a specific source.
環境光が強いと、画面が見えにくくなることがあります。
When ambient light is strong, the screen can become hard to see.
ambient reflection coefficient
Compound of 環境 (かんきょう, 'environment') and 光 (こう, 'light'). A straightforward modern technical term.