Glare Control Diffusers

G-Series Glare Control and Gain Diffusers

Glare Suppression


G-Series diffusers suppress high-angle light above 65 degrees to reduce visual glare and improve the Unified Glare Rating (UGR) of luminaires. This helps luminaires comply with IESNA RP1-04 and EN12464 glare specifications. These patented2 and patent-pending diffusers, unlike conventional prismatic sheets, have a soft cutoff with no color separation thereby increasing visual appeal and LED hiding ability.

New! G-GH85 diffusers offer improved hiding of LEDs.


G-Series diffusers can increase central (on-axis) candela intensity by up to 30%, or as high as 60% when used with a C-HE55 or C-HE80 diffuser.

New! An optional anti-wet-out coating is available on the back surface for compatibility with edge lit lighting (light guide plates). 




L65° / L0°

(% of CBCP,


Lower is better)1

L0° G-Series / L0° Lambertian

(Typical Edge-Lit Panel)1
Angle FWHM (Typical)1 Efficiency in LED luminaire (Typical)1

 G-Series G-Series

with C-HE80 

Smooth 15% 125%



        89 - 93%

 G-GPHS 1.5 mm Hex Pattern

15% 130% 160% 90°         89 - 93%

 G-GPHM  2.4 mm Hex Pattern

13%  130%  160% 90°          89 - 93%
 G-GPHX  10 mm Hex Pattern

12%  130%  160% 90°          89 - 93%

 Smooth with LED hiding


135% 160% 85°


        89 - 93%

 Lambertian Source

(provided for reference)

40%  100%  100%  120°                


Visual Appearance

Glare Control diffusers exhibit a variety of appearances depending on illumination conditions.They can be used in conjunction with C-Series diffusers to better hide light sources and further increase gain.

Glare Control Diffusers

Usage Notes:

  • G-Series diffusers must be flat to achieve glare control; they cannot be formed in curves around lamps
  • G-Series diffusers must be used with the microstructure facing away from the LED or lamp
  • Helps luminaries meet ANSI/IESNA RP-1-04 and EN12464 glare standards for office/indoor lighting
  • Suppression of glare and efficiencies are typical; they vary greatly depending on luminaire design
  • Bright View applications engineers can assist with product choices and help your design achieve peak performance

1Optical performance including Glare, Gain, Angles and Efficiencies are typical; they vary greatly depending on luminaire design. Results shown were measured using a test fixture with lambertian light source in a goniophotometer.

2Protected by patent US9086521, other patents, and pending patent(s).