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2. Artificial sunlight - Wikipedia

   en.wikipedia.org/wiki/Artificial_sunlight

   Artificial sunlight is useful in treating and preventing seasonal affective disorder (also known as winter depression, which causes depression symptoms specifically in winter), [3] and delayed sleep phase syndrome, in which the circadian rhythm (the rhythmic alternation between daylight and nighttime behavior and bodily states) is disturbed and the person falls asleep much later than he or she ...

3. Trump rolls back standards for water-using appliances, light ...

   www.aol.com/news/trump-rolls-back-standards...

   WASHINGTON (Reuters) -President Donald Trump on Tuesday moved to revert to older standards for light bulbs as well as toilets, showers and other water-using appliances, a day after signing an ...

4. Tanning lamp - Wikipedia

   en.wikipedia.org/wiki/Tanning_lamp

   Unfiltered light from a high-pressure lamp is rich in UVC used in germicidal lamps, for water purification, but it damages human skin. The contents of a high-pressure lamp are inert gas (such as argon) and mercury. [2] There are no phosphors used, and the mercury is clearly visible if it is not in a gaseous state.

5. Another winter storm is brewing: These 12 items can help you ...

   www.aol.com/lifestyle/12-genius-items-to-help...

   This water-resistant lantern-and-power bank combo provides bright, adjustable light when darkness falls. And it doubles as a power bank to charge your devices during outages.

6. Indoor tanning - Wikipedia

   en.wikipedia.org/wiki/Indoor_tanning

   Typical F71T12 71-inch, 100-watt, bi-pin tanning lamp. Ultraviolet radiation (UVR) is part of the electromagnetic spectrum, just beyond visible light.Ultraviolet wavelengths are 100 to 400 nanometres (nm, billionths of a metre) and are divided into three bands: A, B and C. UVA wavelengths are the longest, 315 to 400 nm; UVB are 280 to 315 nm, and UVC wavelengths are the shortest, 100 to 280 nm.

7. Hydrargyrum medium-arc iodide lamp - Wikipedia

   en.wikipedia.org/wiki/Hydrargyrum_medium-arc...

   An 18kW HMI Bulb An HMI lamp uses mercury vapour mixed with metal halides in a quartz -glass envelope, with two tungsten electrodes of medium arc separation. Unlike traditional lighting units using incandescent light bulbs , HMIs need electrical ballasts , which are separated from the head via a header cable, to limit current and supply the ...