"fully dark" is a correct and usable phrase in written English.
It usually means that something is completely or entirely dark. Example: As the sun set behind the mountains, the sky became fully dark and the stars began to twinkle.
Thanks to sky glow, ten per cent of the world, and forty per cent of Americans, no longer view a night sky that is fully dark.
The stage goes fully dark, and then, surprisingly, a squiggly outline of yellow lights pops out, defining Koji's form for us.
Competitive electrochromic mirrors and glass take six seconds to change from fully clear to fully dark, Mr. Saxe said, and do not darken uniformly.
Because its rising or setting is always within about two hours of the Sun's, it is never observable when the sky is fully dark.
From Tuesday, the planets will gradually move apart, but remain within five degrees of one another until Saturday, after which their next heavenly meeting in fully dark skies will be on June 2015.
His wife, Gina, told me that the street lights and other lights in their neighborhood were so bright that their bedrooms never got fully dark at night, even though they had curtains.
Representative single-flash ERGs from fully dark-adapted adult control and GLE rats are illustrated in Figure 3A.
A 10-min countdown then ensues, during which time the subject's vision is expected to fully dark-adapt.
Under fully dark-adapted conditions, a central scotopic scotoma exists in people with healthy retinas, corresponding to the foveal rod-free region.
Yet, such gain control is important because it protects retinal signals from saturating as backgrounds increase while permitting the high amplification required to detect absorption of a few photons under fully dark-adapted conditions.
At the same time, left unabated, the high gain associated with fully dark-adapted vision would cause a parasol ganglion cell to generate hundreds of spikes per second for backgrounds producing ∼0.02 R*/rod/s.
