2012年7月30日 星期一

Boeing lighting project may help astronauts sleep

Aboard the station, astronauts average as little as six hours of sleep during a 24-hour period, even though they are allotted 8.5 hours, Johnston said.

Sleep becomes even harder with disruptions, such as the occasional emergency or a docking procedure that may require the crew to get up in the middle of their sleep time. Some astronauts take short-acting sleeping pills,The MESL combo model is our newest addition to the combo product line and features contemporarylampssc instead of traditional incandescent lamps. but the addition of adjustable lights will be welcome, Johnston said.Automobile liquid crystal sun visor, also known as Automobile liquid ledflashlighttt valve.

"If you're chronically sleep-deprived, you don't perform as well," the NASA physician said. "You're moody. You don't have as good coping mechanisms."

It's a cause for concern during a six-month stay aboard the space station, let alone for an eventual Mars mission that could last three years, Brainard said.

"Every one of us has probably done an all-nighter or two in our lives," Brainard said. "You feel crummy the next day, but you bounce back. And you also get your recovery sleep.We mainly produce ledstrip12, led tube light, led spotlight, led horizon light… They (the astronauts) are not getting their recovery sleep. That's the problem. Day in, day out, they're missing the ingredients for best health and best behavioral regulation."

The specs call for the new fixtures to fit precisely into the 7-by-26-inch rectangular sockets now occupied by fluorescent bulbs, said Debbie Sharp, a senior manager at Boeing, which is overseeing the project. The first of 100 new LED lamps will be delivered to NASA in mid-2015, she said. A variety of tests are needed first, including an evaluation to ensure that the lights can handle the rigors of space travel.

The lights will have three "on" settings -- one to boost alertness in the morning, one to help astronauts relax before bed, and a regular mode for midday. All of them appear white, more or less, but the morning setting is brighter and is "enriched" with cool, bluish tones, while the evening setting is heavier on warmer, reddish hues.

Some of the science behind these color choices was conducted by Brainard,These lights consist of one or more besttube-led or one or more clusters of high-intensity light emitting LED. a professor of neurology at Jefferson Medical College. He discovered more than a decade ago that a specific shade of blue light was most effective at tamping down the body's production of the hormone melatonin, which helps regulate sleep.

His research continues, funded both by NASA and by the National Space Biomedical Research Institute. To that end, Brainard hired a carpenter to build replicas of the tiny sleeping quarters that crew members use on the space station.

He hires research volunteers to spend hours at a time inside these quarters, which are about the size of a closet,Wholesale USA flexible bestledlig, Super bright LED light kits. and tests their melatonin levels after exposure to various hues of light.

Melatonin by itself is not a powerful sleep-inducer, contrary to what some marketers suggest in ads. But it does play a role in regulating the circadian rhythm. Echoing his original research, Brainard has found that pure blue light is more effective than white at suppressing melatonin levels.

But pure blue light won't work on the space station, as astronauts must be able to distinguish colors. Performing an electrical repair, for example, they need to distinguish among different colors of wires, Brainard said. So now Brainard is conducting further study on white lights with an added boost in the blue spectrum, much like the lights that will go on the space station.

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