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faqWatts are the unit of measure for electrical power. Lamps are classified by wattage to indicate effective consumption of electricity.
The index of colour fidelity (ICF) is the international system used to evaluate the capacity of a lamp to render the colours of objects. The higher the ICF, based on a scale from 1 to 100, the higher the colour fidelity.
Kelvins indicate the temperature of colour and, consequently, the shades of light.
The higher the temperature, the cooler the light.
White hot refers to a colour temperature of around 3,000°K, which provides a white-yellowish light.
Cool white refers to a colour temperature of around 4,000°K.
Daylight refers to lamps having a colour similar to that of daylight, tending to sky blue, usually with a colour temperature of 6,500°K.
Lumen is the unit of measure of luminous flux, defined as 'luminous efficacy'.
Lux is the unit of measure of illuminance and in practice indicates the amount of light striking a unit of area.
Lumen and Lux are two different measures of luminous flux. While Lumen indicates the amount of light in a spherical portion, Lux indicates the measurement relative to the flat area tangent to the spherical portion.
1 Lumen over an area of 1 m² corresponds to 1 Lux while the same Lumen concentrated in 1 cm² corresponds to 10,000 Lux.
Metal halide lamps are high intensity discharge sources of light where light is produced by radiation from Mercury, together with iodides of metals such as sodium, scandium, indium and dysprosium. Some types also use phosphorus linings.
Halogen lamps are incandescence lamps with a filament surrounded by halogen gas, such as iodine and bromine, that allow filaments to function at higher temperatures and better efficiency. The halogen takes part in the tungsten cycle to extend the duration of the lamp.
Discharge lamps are lamps where light is produced by an electrical discharge between two electrodes, unlike a filament lamp.
Ultra-violet radiation is defined, for practical reasons, as any radiant energy lying in the 100-380 nanometres interval. It lies beyond the blue or violet region of the spectrum and is invisible to the eye, in the same way that “ultra-sound” dog whistle is imperceptible to the ear.
UV radiation is divided into three regions:
UVA......100 - 280 nm
UVB......280 - 315 nm
UVC......315 - 400 nm
Certain wavelengths (180-220) produce ozone, others (220-330) are bactericidal, others (280-320) cause erythemas (reddening/rash of human skin) and others still (320-400) secondary luminance (black light).
Infra-red radiation is the electro-magnetic energy irradiated in the wavelength range between about 770 and 1,000,000 nanometres. The energy in this range is not visible to the human eye but may be perceived by the skin in the form of heat.
PAR is the acronym for Parabolic Aluminized Reflector. A PAR lamp may use an incandescence, halogen or HID arc tube filament and is a precision floodlight.
The term “dimmable” indicates the possibility or otherwise of varying the brightness of the lamp while retaining reliability.
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