Light Balancing Filters

When the color of a light source is visually identical to, or extremely close to, that of the ideal radiator, which has been heated to a certain temperature, the temperature is defined as the color temperature of the light source, and is expressed in degrees Kelvin (K).

Taking 106 times the reciprocal of color temperatures and calling this unit a "Mired" (micro reciprocal degree), the unit is used to represent conversion values.

Assuming K1 to represent the color temperature of an original source, and K2 the color temperature of lights through a filter, the conversion values of the filter may be expressed with the following formula:

This takes on a negative value, lowering color temperatures for amber-type filters (LA series), and a positive value, raising color temperatures for blue-type filters (LB Series).

When desiring light balancing filters other than those contained in this catalog, the above formula provides the specifics. Variations in conversion values among melts may be compensated by controlling thickness.

  • LA-20 +20 mireds Lowering color temperature 2.5 mm
  • LA-40 +40 mireds Lowering color temperature 2.5 mm
  • LA-80 +80 mireds Raising color temperature 2.5 mm
  • LA-120 +120 mireds Raising color temperature 2.5 mm
  • LA-140 +140 mireds Raising color temperature 2.5 mm
  • LB-20 -20 mireds Raising color temperature 2.5 mm
  • LB-40 -40 mireds Raising color temperature 2.5 mm
  • LB-80 -80 mireds Raising color temperature 2.5 mm
  • LB-100 -100 mireds Raising color temperature 2.5 mm
  • LB-120 -120 mireds Raising color temperature 2.5 mm
  • LB-145 -145 mireds Raising color temperature 2.5 mm
  • LB-165 -165 mireds Raising color temperature 2.5 mm
  • LB-200 -200 mireds Raising color temperature 2.5 mm

 

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