HMG-6 Minus Green Filter

HMG-6 combines minus green correction with aggressive UV rejection, blocking 99.5 % of ultraviolet radiation at 380 nm while delivering robust green suppression in the 540-580 nm zone. This specialized half minus green filter targets the yellow-green problem region with peak suppression at 605 nm where fluorescent and discharge lamps concentrate excessive spectral energy. Red transmission peaks at 93.7 % while blue and early green bands remain serviceable, creating a color-corrected output free from both UV contamination and yellow-green dominance. The dual action - UV elimination plus green dampening - makes it essential for sources combining mercury vapor arc characteristics with phosphor-driven fluorescence.

Key Advantages

• Near-Total UV Suppression - Blocks 99.5 % of UV at 380 nm, eliminating sensor noise, false color channels, and image degradation from invisible radiation present in mercury vapor and some LED arrays
• Targeted Yellow-Green Dip - Deep suppression in the 540-580 nm region (53-72 %) addresses the exact spectral problem zone of old fluorescent and sodium discharge sources without over-dampening pure green
• Preserved Red & Early Green - Maintains 94 % red and 85 % green in the 510-540 nm band, allowing natural skin tone reproduction while cutting the yellow-cast region where fluorescents peak
• Hard-Oxide Ion-Assisted Coating - Multilayer dichroic structure withstands thermal stress from UV-rich heat sources and field handling, ensuring coating integrity across production schedules
• Custom Format Options - Engineered in round, square, free-form blanks from 5 mm to 450 mm at thicknesses 0.21-3.8 mm on Borofloat, soda-lime, Schott D263 T, or Corning Eagle XG substrates

Typical Applications

• Fluorescent-Heavy Interior Shoots - Eliminate green casts from old T12/T8 systems and sodium vapor security lighting in parking garages, warehouses, and commercial interiors where UV scatter also affects color
• Industrial Machine Vision - Achieve clean white balance in factory floors lit by aging mercury vapor and mercury-halide lamps, reducing UV-induced noise and sensor calibration drift
• Outdoor Events Under Discharge - Correct mixed-source conditions: daylight through venue discharge lamps and temporary mercury-based work lights on construction and outdoor film sets
• Scientific & Medical Instrumentation - Reduce UV artifacts in spectroscopy, microscopy, and diagnostic imaging where excess ultraviolet from sample illumination contaminates color channels
• Archival & Museum Photography - Safely illuminate artifact documentation under LED fixtures with UV leakage while correcting green excess, protecting sensitive materials from invisible radiation

HMG-6 is available for quick prototyping with various backup substrates. Production volumes scale efficiently with custom specifications.