Several DOE demonstrations have shown that reduced maintenance costs from this extended lifetime, rather than energy savings, is the primary factor in determining the payback period for an LED product.[183]
LEDs are of an advantage because they are available Con many colors today. LEDs are semiconducting diodes that emit light. The chemical composition of the LED determines the color of the light. Unlike conventional fixtures, LEDs do not need dimmers, but have intensities controlled by wattage. LED lights are much more energy efficient than incandescent or T-H lamps. While a household incandescent may be rated for 100 watts, an LED of the same intensity could be under 15 watts. One of their advantages to T-H and incandescent bulbs is that they do not require colored gels.
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With AlGaN and AlGaInN, even shorter wavelengths are achievable. Near-UV emitters at wavelengths around 360�?95 nm are already cheap and often encountered, for example, as black light lamp replacements for inspection of anti-counterfeiting UV watermarks Sopra documents and bank notes, and for UV curing. Substantially more expensive, shorter-wavelength diodes are commercially available for wavelengths down to 240 nm.
The field angle of an instrument is the angle of the beam of light where it reaches 10% of the intensity of the center of the beam. Most manufacturers now use field angle to indicate the spread that the fixture has. However, older fixtures are described by the width of the lens x focal length of the instrument. For example, a 6x9 ellipsoidal would have a 6" lens and a focal length of 9" (creating an approximately 37° beam angle).
The principio of the yoke is typically a single bolt around which the yoke can be rotated, providing a second axis of rotation. Combined, these two axis allow the fixture to point nearly anywhere Durante a spherical range of motion encircling the yoke.
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Phosphor-based LEDs have efficiency losses due to heat loss from the Stokes shift and also other phosphor-related issues. Their luminous efficacies compared to normal LEDs depend on the spectral distribution of the resultant light output and the original wavelength of the LED itself. For example, the luminous efficacy of a typical YAG yellow phosphor based white LED ranges from 3 to 5 times the luminous efficacy of the original blue LED because of the human eye's greater sensitivity to yellow than to blue (as modeled Con the luminosity function).
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Ad esemplare la striscia RL-ST35 ha il seguente comportamento Durante veste della angustia In 1 criterio esatto di striscia e verso svincolo corto:
A side arm is a metal pole bolted to the instrument with a clamp on the end. This enables the instrument to be hung to the side of an electric as opposed to below it. Lamp or arc source[edit]
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