Some of the purposes that UV lamps are designed for are to attract bugs and other insects. There may be a electric system rigged to the lamp to kill the insects as they hit the lamp. Other uses include black lights, which illuminates certain materials. UV light is invisible to the human eye, but makes other materials florescent.
When looking to buy a 75W replacement UV bulb then there are several sites on the internet that sell them. There are sites such as Amazon, Maplin, eBay, Tesco and Reptile UV who all offer Ultraviolet light bulbs and lamps for sale.
If you are referring to fluorescent and CFL lamps, it can never be totally eliminated. These are mercury vapor arc lamps using a phosphor to turn the UV to visible light. They have reduced the mercury dramatically, but it can't be totally eliminated. If all fluorescent and CFL lamps were banned and lighting was all converted to LED then use of mercury could be stopped. However most LED lamps cost at least ten times what CFL lamps cost.
There is no indication that a thin layer would be much protection from UV-B or more energetic radiation from the Sun. It does absorb / emit quite broadly in the UV-A range.
Tryptophan is an amino acid that absorbs UV radiation. It has a strong absorption peak in the UV range, around 280 nanometers, which makes it useful for studying protein structure and interactions using techniques such as UV spectroscopy.
One emits light in the ultra-violet range, and the other emits light in the infrared range.
A black light is a UV emitting bulb. There are other types of UV bulbs, but most have very specific uses, such as: bug lights, tanning bed lamps, drying lamps for lithographic applications and printing, and medical diagnosis. All lamps--incandescent, fluorescent, mercury vapor, tungsten, etc.-- emit some range of UV light, so could be considered UV lamps, but that is not their specific purpose, and the amounts or levels vary widely.
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The fluorescent type of light bulbs (correctly called lamps) have a phosphor that besides emitting visible light (400 to 750 nm) also emits some UV enengy in the UV-A range. Plants need visible light and some UV-A to be effective.
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1. Probably from collectors of uranium glass objects - some broken parts. 2. For UV lamps see the link below, but many sellers of these lamps exist.
Nowhere. A tanning bed uses UV lamps.
It is used in UV lamps, paint testes, projection lamps, electronic flashes, xenon arc lamps etc. It is also used in photography and as a general anaesthetic.
Yes, Low Pressure and Medium (High) Pressure Mercury lamps are manufactured and used for UV treatment of water etc. Medium (High) pressure UV lamps have a relatively broadband output, with many emission wavelengths between 200 and 400nm, whilst Low Pressure UV lamps have a much reduced output to the extent that they are frequently referred to as monochromatic.