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Sunbeam 16988 5-In-1 Night Light & Emergency Flashlight ... These ones from Sunbeam are made with a color-changing LED light that automatically turns on from dusk to dawn for everyday use or can ...
Sunbeam 16986 3-in-1 InstaBeam LED Light, pack of 3 ... These ones from Sunbeam are made with an LED light that automatically turns on from dusk to dawn for everyday use or can be set to only come ...
Nearly 6,000 Walmart reviewers have given this gadget a 4.8-star rating, which speaks for itself. "This Grabber worked perfectly for me. Right size for someone in wheelchair," said one reviewer.
A dawn simulator can be used as an alarm clock. Light enters through the eyelids triggering the body to begin its wake-up cycle, including the release of cortisol, so that by the time the light is at full brightness, sleepers wake up on their own, without the need for an alarm. Most commercial alarm clocks include a "dusk" mode as well for bedtime.
They give light immediately on startup, but usually need a few minutes to restrike if power has been interrupted. Because of the light emitted by the filament, they have slightly better color rendering properties than mercury-vapor lamps. Self-ballasted lamps are typically more expensive than a standard mercury-vapor lamp.
[1] [failed verification] At nautical dawn and nautical dusk, the human eye finds it difficult, if not impossible, to discern traces of illumination near the sunset or sunrise point of the horizon (first light after nautical dawn but before civil dawn and nightfall after civil dusk but before nautical dusk). [citation needed]