candela

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candela

 (cd) [kan-del´ah]
the base SI unit of luminous intensity.

can·de·la (cd),

(kan'de-lă),
The SI unit of luminous intensity, 1 lumen per m2; the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 Hz and that has a radiant intensity in that direction of 1/683 W per steradian (solid angle).
Synonym(s): candle
[L.]

candela

The SI (International System unit) of luminous intensity in a given direction from a source emitting monochromatic radiation of a frequency of 540 X 1012 hertz, where the energy in that direction is 1.464 X 10-3/steradian.

can·de·la

(kan-dē'lă)
The SI unit of luminous intensity, 1 lumen per m2; the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian (solid angle).
[L.]

candela 

The candela is the luminous intensity in a given direction of a source emitting monochromatic radiation of frequency 540 ✕ 1012 Hz and the radiant intensity of which in that direction is 1/683 watt per steradian. The candela so defined is the base unit applying to photopic quantities. Symbol: cd.
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Information about the products that are registered with Lighting Facts is accessible from the products page of the Lighting Facts website, including Lighting Facts label data and, at the manufacturer's discretion, additional metrics from the LM-79 test reports--such as power factor, zonal lumens, beam angle and center beam candle power. There are also special qualifications or recognition a product has received--such as being evaluated in a DOE Gateway demonstration project, being Energy Star-qualified, or winning a design competition such as Next Generation Luminaires.
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Perfect way to light up your Christmas; Gabrielle Fagan on how candles can add a sparkle to your home during the festive period

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