what does a blue light on your porch mean?

Answer 1

You ran out of yellow lights

Answer 2

I'm not sure, but blue light helps you to feel more alert for some reason. But I'm pretty sure that people who use a blue light on the porch just like the way it looks. Or maybe they're trying to see the underwear of their visitors ?

"A small study of 16 volunteers found that exposure to short-wavelength light, or blue light, perked them up immediately.
"Light exposure to this system, particularly blue light, directly reduces sleepiness," said Steven Lockley of the Brigham and Women's Hospital. "Subjects exposed to blue light were able to sustain a high level of alertness during the night when people usually feel most sleepy, and these results suggest that light may be a powerful countermeasure for the negative effects of fatigue for people who work at night."
http://www.livescience.com/health/060201_blue_light.html

Bug lights are yellow... not blue.
Lamps which insects have a difficult time seeing include incandescent, high-pressure sodium, and bug light incandescent (yellow).

Answer 3

Take off those blue tinted shades man its evening!
Actually I don't know. but I did find an interesting article about blue light.

There's much more than meets the eye to how we perceive light, researchers have learned in recent years. The latest revelation: blue light helps fend off drowsiness in the middle of the night.

A small study of 16 volunteers found that exposure to short-wavelength light, or blue light, perked them up immediately.

"Light exposure to this system, particularly blue light, directly reduces sleepiness," said Steven Lockley of the Brigham and Women's Hospital. "Subjects exposed to blue light were able to sustain a high level of alertness during the night when people usually feel most sleepy, and these results suggest that light may be a powerful countermeasure for the negative effects of fatigue for people who work at night."

The study, sponsored by National Space Biomedical Research Institute, is detailed in the Feb. 1 issue of the journal Sleep.

"The effects lasted as long as the blue light was on, which was 6.5 hours," Lockley told LiveScience. "I expect it would last at least for a few hours more if we extended the light exposure for longer although not ad infinitum. We hope to do studies with longer exposures shortly."

The work adds to other evidence that the human eye sees things we're not consciously aware of. Other research has shown that the eye's hidden perceptive abilities help control our 24-hour internal clock, so we know when to sleep and when to wake.

"These findings add to the body of evidence that illustrates that there is a novel photoreceptor system that exists in the human eye in addition to that used for sight," Lockley said.

Eventually the finding could lead to ways to improve alertness in nighttime drivers, shift workers, pilots or astronauts, said Lockley, who is also an Assistant Professor at Harvard Medical School.

More work needs to be done, however. Blue light in the wrong doses can be dangerous to the eye.

Note Its interesting that for years "Blue Lights" have been refered to as party lights ?!

Answer 4

Most bug lights have a blue light

Answer 5

Green-Military
Blue- Police
Red- Fire/Rescue

Answer 6

it means you like blue light bulbs

red has a meaning, but i dont think blue does

Answer 7

It means you support Law Enforcement. The same as the thin blue line, or the American Flag with one blue stripe.

Answer 8

Blue light is for fallen officers and suicide prevention. Around here the blue lights were turned on for a fall and female officer

Answer 9

Autism awareness.

Answer 10

They zap mosquito's