White light balancing Filter
Corrects artificial white lighting so colours appear more natural. LA
series (amber) reduce blue shading often strongly dominant in white LED,
Xenon strobe and metal halide lighting. LB series (blue) reduce the red
in tungsten and halogen lighting. FL series fluorescent lighting filters
and other wavelength enhancing filters are available.
| LA120 Light Balancing
Filter (minus Blue+)
|
Model |
Transmission |
Features |
Suitable
for |
| LA120 |
Passes 500nm+
Absorbs UV and blue 200-500nm
Reduces 400-500nm |
• Single substrate, hard-coated filters
• Cost-effective solution |
• Use with white 6500ºK LEDs
• Obtaining accurate colour rendition |
| 
These single substrate, hard-coated filters to be preferred for
use with white LED lighting when accurate colour rendering is desired.
White LEDs typically have a steep blue "spike" that results
in a strong overall bluish cast to the subject being illuminated.
Not only can this be disconcerting, poor color rendition may result
in difficulties in some color inspection applications.
While there currently are “warm white” LED lighting
options available, they are significantly more expensive, have significantly
lower output, a shorter lifetime, and often a slight bluish tint
still remains. Using only an LA120 filter over the camera lens with
standard, less expensive white LEDs works just as well and is far
more cost effective.
This same benefit can be seen when using an LA120 filter in subjects
illuminated with some metal halide and mercury lighting as well
|
(Left) 6500ºK LEDs put out a lot of blue.
(Right) LA120 limits the blue cast for accurate hue and brightness |
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| LB080
Light Balancing Filter – Minus Red – removes yellow
cast from halogen lighting
|
Model |
Transmission |
Features |
Suitable
for |
| LB080 |
Passes 370-520nm
Absorbs 360nm and below; 540-1100nm |
• Raises the lower colour temperature associated
with lighting with a higher percentage of red component to give
a more natural-looking colour |
• Applications using fibre-optic
lighting |
| 
Single substrate, hard-coated LB080 filters are used to raise
the lower colour temperature associated with lighting with a higher
percentage of red component, in order to create more natural looking
colour. Its name is derived from the mired shift value; approximately
-80 mired.
These filters are often used in association with fibre optic
lighting and are sometimes referred to as "blue" filters
because of their bluish colour.
|
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| FL550
Light Balancing Filter – Minus Green – removes green
cast from fluorescent |
Model |
Transmission |
Features |
Suitable
for |
| FL550 |
Passes 400nm and above
Absorbs 390nm and below |
• Absorbs somewhat in the middle of the visible
portion of the spectrum
• Improves colour rendition due to the above
|
• Eliminating the strong greenish colour that
results when white fluorescent lighting is used for illumination
|
| 
This pinkish-coloured, single substrate, hard-coated filter is
used to eliminate the strong greenish color that results when
white fluorescent lighting is used for illumination. It absorbs
somewhat in the middle of the visible portion of the spectrum,
which is also where some colour cameras have their strongest visible
response, resulting in improved colour rendition.
|
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