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Original 4–13 W miniature fluorescent range from 1950s or earlier. [1] Two newer ranges, high-efficiency (HE) 14–35 W, and high-output (HO) 24–80 W, introduced in the 1990s. [2] Panasonic's range of FHL fluorescent tubes in 18W, 27W, and 36W varieties for the Japanese market. Circular fluorescent tubes.
12 v: 13 w ansi № 828| pw13w wp3.3×14.5-7 1 12 v: 13 w pc16w pu20d-1 1 12 v: 16 w ansi № 7010 pcr16w pu20d-7 1 12 v: 16 w red pw16w wp3.3×14.5-8 1 12 v: 16 w ansi № 7445 pwr16w wp3.3×14.5-10 1 12 v: 16 w red pwy16w wp3.3×14.5-9 1 12 v: 16 w amber, ansi № 7448 ps19w pg20-1 1 12 v: 19 w ansi № 5201 psy19w pg20-2 1 12 v: 19 w
It is the ratio of luminous flux to power, measured in lumens per watt in the International System of Units (SI). Depending on context, the power can be either the radiant flux of the source's output, or it can be the total power (electric power, chemical energy, or others) consumed by the source.
100-watt incandescent blacklight bulb A blacklight may also be formed by simply using a UV filter coating such as Wood's glass on the envelope of a common incandescent bulb . This was the method that was used to create the very first blacklight sources.
Most CFLs contain 3–5 mg per bulb, with the bulbs labeled "eco-friendly" containing as little as 1 mg. [81] [82] Because mercury is poisonous, even these small amounts are a concern for landfills and waste incinerators where the mercury from lamps may be released and contribute to air and water pollution.
Fluorescent lamps convert more of the input power to visible light than incandescent lamps. A typical 100 watt tungsten filament incandescent lamp may convert only 5% of its power input to visible white light (400–700 nm wavelength), whereas typical fluorescent lamps convert about 22% of the power input to visible white light. [32]: 20
The 26th General Conference on Weights and Measures (CGPM) redefined the candela in 2018. [10] [11] The new definition, which took effect on 20 May 2019, is: The candela [...] is defined by taking the fixed numerical value of the luminous efficacy of monochromatic radiation of frequency 540 × 10 12 Hz, [a] K cd, to be 683 when expressed in the unit lm W −1, which is equal to cd sr W −1 ...
Ultraviolet radiation, also known as simply UV, is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun.
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