An ISO 9001:2008 company
DIGITAL LUX METER
Model - KM-LUX-99 / KM-LUX-200K
GENERAL INFORMATION
All models have a fast and accurate response. The sensors are cosine and color corrected
and sealed to ensure long term stability. These meters come ready to use with 9V battery, Carrying Case,
Instructions & 1 year warranty.
Light can be quantified in many ways, i.e., Lux, Lumens, Footcandles, Candle Power, Candelas, and so on. The
two most popular scales are Lux, which is the European measure, and Footcandles which is the U.S. Scale.
Lux is a unit of illumination on one square meter which is one meter away from a uniform light source.
1 candela = 1 Lux.
Footcandles are a unit of illumination on one square foot which is one foot away from a uniform light source.
Light Measurement Conversion Factors
Abbreviations :
FC = Footcandle, Lux = Lux, Lumen = Lumen
How Light Meters Work
Most meters consist of a body, a photo cell and a readout. The light that falls on the photo cell has energy. This
energy is transferred by the photo cell into electric current; the amount of current generated depends on the
amount of light striking the cell. The meter then reads the electrical current and calculates the appropriate value of
either Lux or Footcandles.
A key thing to remember about light is that it is usually made up of many different types (colors) of light at different
wavelengths. The reading, therefore, is a result of the combined effects of all the wavelengths. A standard color
can be referred to as color temperature and is expressed in degrees Kelvin. The standard color temperature for
calibration of most light meters is 2856 degrees Kelvin which is more yellow than pure white.
Different types of light bulbs burn at different color temperatures. “KUSAM-MECO” meter readings will, therefore,
vary with different light sources of the same intensity. This is why some lights seem “harsher” than others. See
the chart below for suggested lighting levels for various applications.
And;
1 square foot = 0.0929
square meters
Then;
1 Lux = 0.0929 Fc,
and 1 FC = 10.76 Lux.
Since :
1 FC = 1 Lumen / square foot,
and 1 Lux = 1 Lumen /
square meter
