Rosco 120-PERMA-2050

2" x 2" Square Glass Dichroic Filter

OUR PART #:  120-PERMA-2050 Write the First Review.

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For lighting designers that require long-lasting, high-quality filters Rosco Permacolor™  glass dichroic filters are an ideal option.
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For lighting designers that require long-lasting, high-quality filters Rosco Permacolor™ glass dichroic filters are an ideal option. This model, the 120-PERMA-2150 is a 2" x 2" square glass dichroic filter that is 1.75mm thick. Rosco Permacolor glass dichroic filters are durable, high temperature, high transmission glass color filters, that change the color of the light emanating from the fixture.

Permacolor filters withstand the heat of high temperature lighting fixtures like MR16, metal halide, and high wattage tungsten lamps thus making it ideal for use in permanent installations. Rosco Permacolor glass dichroic filters are manufactured to exacting tolerances in a state-of-the-art, physical vapor deposition system. This optimally sized manufacturing line allows for unprecedented control of color and film density. Permacolor filters are extremely durable and precisely repeatable, meeting the high expectations of entertainment and architectural lighting designers throughout the world.

Dichroic filters can be installed with either the coated side of the filter towards or away from the lamp. This may be application dependent. To determine the coated side of the filter, touch the point of a pen or pencil to the glass. If you are touching the coated side, the tip will appear to touch its reflection in the glass. On the un-coated side, the reflection appears with a small gap between the points.

Rosco 120-PERMA-2150 Specifications:

  • Size: 2" x 2” (50.8 mm) square
  • Cutting Tolerance:
    • ±.25mm
    • Tolerance can depend on glass thickness or texture.
  • Angle of Incidence:
    • 0º to 45º
    • Wavelength movement can depend on overall film thickness.
  • Surface Defects: 80 - 50 — Mil. O-13830 Scratch/DigTest (.08mm Scratch or .5mm Dig per 20 sq. viewed by unaided eye w/ 40 watt source)
  • Humidity: Passes Mil. C-48497 (95 - 100% @ 50C per 24 hour period)
  • Transmission: Spectral distribution curves are available for all Permacolor filters.
  • Thickness:
    • Standard thickness:
      • 1.75 mm ±0.2mm
      • 3.3mm ±0.2mm
      • Optional thickness: 1.1mm ±0.2mm
    • Temperature:
      • Maximum short term (< 1 hour): -58° F to 842° F (-50º C to 450º C)
      • Maximum continuous (> 24 hours): 392° F (200º C)
    • RTD < 90K (hot spotting)
    • Color Tolerance: ± 5nm of designed Half Height
    • Adhesion: Passes Mil. C-48497 (Cellophane Tape Test)
    • Abrasion: Passes Mil. C-48497 (Moderate, 50 strokes with cheesecloth under 1 pound force, and severe, 20 strokes with coarse eraser under 2 pounds of force.)
    • Aperture: >95% (guaranteed usable area)


This glass filter is available in several colored tints as shown above. Please contact your Sales Pro for more information on ordering this glass filter in a custom size.

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