for questions about claims based on, or related to, visible light.
Questions tagged [light]
28 questions
8
votes
1 answer
Can blue light therapy contribute to Age-related Macular Degeneration?
High-intensity, broad-spectrum light has been an effective therapy for Seasonal Affective Disorder (SAD). More recently and less proven blue light therapy has stemmed from the discover of ganglion cells that do not contribute to sight but are…
Adam Wuerl
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7
votes
1 answer
Do fluorescent lights use more power to turn on?
I have been told time after time that at school if you are not going to leave the room for more than 10 minutes to keep the lights on instead of turning them off because the amount of power it takes to turn them back on is more than just leaving…
Nick
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7
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1 answer
Do light boxes help Seasonal Affective Disorder?
Light boxes are sold as a treatment for seasonal affective disorder (SAD) and seasonal mood swings. The claims listed are:
Helps to ease seasonal mood swings and winter depression, and help improve sleeping patterns
Can ease symptoms of SAD within…
AppliedSide
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6
votes
0 answers
Does too much artificial lighting result in increased crime and safety problems?
According to a Washington Post article, Nebraska's tourism board is applying for dark sky certification for the Merritt Reservoir State Recreation Area. As part of their application, they are
planning dedicated educational programming related to…
pacoverflow
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6
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Does milk sold in a store with good product turnover lose a significant amount of Vitamin B2 from light exposure?
Anchor New Zealand has just released a milk bottle with a black plastic layer to protect the milk from exposure to light, and thus from loss of "taste and goodness". Their chart:
from their website specifically shows test results relating to…
Highly Irregular
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5
votes
1 answer
Can light travel at 30x the speed of light?
The claim seems to be that the researchers can make light travel faster than the speed of light.
Is this true? How does it even make sense?
It’s in Nature so presumably there’s something in it, but the claim seems nonsensical to me. What’s going…
A E
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5
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3 answers
Are blue lights giving people cancer?
A recent article in Gizmodo reports:
Researchers have linked the modern form of LED street lighting to higher rates of breast and prostate cancer, in a grim development that could have repercussions for everything we look at in today's backlit…
matt_black
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Does the "Re-Timer" device help to alleviate "winter blues"?
The Re-Timer website states:
Re-Timer is a wearable light therapy device for Winter Blues.
Winter Blues is a low-mood experienced primarily during the winter months. Symptoms can include loss of energy, weight gain and difficulty…
P_S
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4
votes
1 answer
Does looking at a monitor screen in a room with very low light source damage your eyes?
Suppose a person wants to play computer games at night without turning on the room lights. The only light source in the room is that monitor screen that the person is looking at -- with normal brightness, of course.
Does looking at a monitor screen…
holydragon
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4
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Does UV-A light from sunlight damage our vision?
Ultraviolet (UV) light is divided into wavelength bands. UV-A is the 315-400nm.
The American Optometric Association claim that UV-A may cause injury to the eye:
WHAT PART OF THE UV RADIATION IS HARMFUL TO THE EYE?
Ultraviolet radiation in sunlight…
Alan Cook
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3
votes
3 answers
Evidence for the absolute speed of light
I'm wrapping my mind over Einstein's Special Relativity. He postulates an abolute speed of light which concludes (in my perspective) to several illogical paradoxes. Is there any evidence, that the speed of light is absolute and not relative to the…
Rafael T
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3
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Does light pollution matter for Insect declines and agroecosystems?
Recently it was claimed that the increase in artificial light at night was a significant contributor to the 'ecological armageddon' of decreasing insect populations. It was further argued that the transition to more blue light emitting LEDs made the…
LangLаngС
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Speed of light not constant as measured by many scientific / research groups, but averaged & politically standardized?
In banned/ removed TEDxTalk,
The Science Delusion - Rupert Sheldrake at TEDx Whitechapel, the speaker has talked about various things but I am focused on the "constants" such as "light" that he has mentioned.
He says:
"Speed of Light apparently as…
Alex S
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