Lux ( lux, legal symbol lx ) illuminance unit, which is a distance from a light source with a light intensity of lcd , and the intensity of illumination received at 1 meter, commonly known as candlelight . Meters. That is , the illuminance when receiving 1lm light flux at an area of 1 meter from the light source .
The basic physical unit of energy or work ( joule, legal symbol j ) is equal to the work done by a force of 1 Newton (N) at a distance of 1 meter, or the energy consumed.
1 Joule = 107 Erg = 1 Watt.s
Newton ( Newton, legal symbol N ): A unit of force that forces a kilogram of mass to accelerate by 1 meter per second per second .
1N = 105dyne (Dyne )
Watt ( watt, legal symbol W ): a unit of power, the work done per unit time ( 1 second) is equal to the power at 1 Joule
1W = 1J / S; 1j = 1W.s
Photometric units of the International System of Units (SIE Unit System )
Name Symbol Unit English Name
Light Intensity I Candela (cd)
Illumination E Lux (lx)
Luminance L Nit