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Peter Bird

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Discharge Type of square law
Lumen Filaments are made from this metal
Envelope Flow of light radiated fron a single source
Monochromatic Radiation given off by mercury lamps
Electromagnetic Light consisting entirely of one wavelength
Sodium Measurement of power
Halogen Takes into account deterioration of reflecting surface and light output
MaintenanceFactor Light is this type of radiation
Mercury Measure of the brightness of the light reflected from a surface
Glow Name given to the outer glass vessel of lamp
Efficacy Lamp output compared to energy input
Prism These types of lamps do not rely on the heating of a filament to produce light
Flourescent Provides the starting voltage and current control
Capacitor Lamp will not restrike if mains fails until this has reduced through cooling
Pressure Gas contained in some types of filament lamps
Ultraviolet Type of discharge lamp
Tungsten Device which splits light into seven colours
Luminance The ability of the lamp to show colours faithfully
ColourRendering Name of filament in discharge lamps
Cathode Device used in discharge lamp circuits to improve power factor
Watts Type of lamp often used for street lighting
Choke Type of vapour contained in flourescent lamps
Inverse Type of starter used in flourescent lamp circuits

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