Standard for USA/Canada: 120V/60Hz, 277V/60Hz
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Optical elements with selective transmission. Filters only transmit part of the incident radiation, to produce either coloured light or by filtering out invisible radiation such as ultraviolet or infrared. Filter effects can be achieved by absorption (absorption filter) or reflection (reflection filter). Interference filters are effective reflection filters that work using special vaporised coatings; they are also known as dichroic filters.