HOYA LIGHT BALANCING FILTERS from Bes Optics, Inc. - Hoya light balancing filters are used for either lowering or raising the color temperature of a light source.


	Hoya 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 to the sixth times the reciprocal of the color temperature and calling this unit a "Mired" (micro reciprocal degree), the unit is used to represent conversion values. These filters are used for either lowering or raising the color temperature of a light source.

Glass type	Mired shift value	Use	Catalog thickness
LA-20	+20 mireds	Lowering color temperature	2.5 mm
LA-40	+40 mireds	Lowering color temperature	2.5 mm
LA-60	+60 mireds	Lowering color temperature	2.5 mm
LA-80	+80 mireds	Raising color temperature	2.5 mm
LA-100	+100 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
LA-200	+200 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-60	-60 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

Below are approximate spectral curves for the above filters


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