2012 | OriginalPaper | Chapter
Illumination Sources
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Abstract
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3D radiation pattern
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Ability to control the lamp brightness
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Brightness, including long-term variations due to lamp ageing
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Driver (AC /DC, frequency, closed-loop control)
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Efficiency, measured by the ratio of the optical emission power to the electrical power consumed
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Electrical noise generated
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Heat produced
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Infra-red content of the beam
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Life-time, measured simply by how long before the lamp becomes so dim as to be useless, or stops emitting altogether
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Long-term degradation of emitted power
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Power-line ripple
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Shape
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Short-tem stability of emitted power
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Spectrum (This requires a much more detailed analysis than simply stating the “colour”.)
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Ultra-violet content