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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 10(6) 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.

Type Mired Temp Stat
LA-20
LA-40
LA-60
LA-80
LA-100
LA-120
LA-140
LA-200
+20
+40
+60
+80
+100
+120
+140
+200
Lowering color temperature
Lowering color temperature
Lowering color temperature
Raising color temperature
Raising color temperature
Raising color temperature
Raising color temperature
Raising color temperature
LB-20
LB-40
LB-60
LB-80
LB-100
LB-120
LB-145
LB-165
LB-200
-20
-40
-60
-80
-100
-120
-145
-165
-200
Raising color temperature
Raising color temperature
Raising color temperature
Raising color temperature
Raising color temperature
Raising color temperature
Raising color temperature
Raising color temperature
Raising color temperature