What is the difference between line voltage and low voltage?

Vision where the rods of the retina are exclusively responsible for seeing, typically like the light levels in the countryside on a moonless, starlit night.

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A high intensity discharge light source in which the light is produced by the radiation from mercury, plus halides of metals such as sodium, scandium, indium and dysprosium. Some lamp types may also utilize phosphor coatings.

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A unit of wavelength equal to one billionth of a meter

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A high-intensity discharge light source operating at a relatively high pressure about 1 atmosphere and temperature in which most of the light is produced by radiation from excited mercury vapor. Phosphor coatings on some lamp types add additional light and improve color rendering.

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Seasonal affective disorder (or SAD) is a form of depression caused by the lack of sunlight. It usually occurs in winter when natural light levels decrease. A common treatment for this condition is phototherapy, in which a light box is used to expose the patient to high levels of light for prolonged periods. Because of the high level of light used and the risk of eye damage due to ultraviolet radiation exposure, people who may be suffering from SAD should consult a health professional, wh...

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