民用晨光始 beginning of civil morning twilight

天文晨光始 beginning of astronomical morning twilight

航海晨光始 beginning of nautical morning twilight

曙光始 beginning of morning twilight

曙光始含 DAWN

曙光始含/唤醉 DAWN

原始光洁面 plate finish ; platefinish

初始荧光 Fo ; minimal fluorescence

初始光通量 initial luminous flux ; LED initial flux ; Initial Lumen ; Luminous Flux

灯具初始光通量 Led Initial Flux ; Initial Flux