TECHNIQUE5 MIN · 01 JUN 2026
Cut-off angles: why dark-light reflectors disappear from sight
V
Vikram R.
Industrial Design Lead
Achieving UGR < 12 without sacrificing foot-candles. The physics of 45-degree shielding angles and specular black baffles.
The highest praise for an architectural downlight is when someone standing in a brightly lit room looks up and asks, 'Where is the light actually coming from?'
The Geometry of Quiet Ceilings
By setting the COB emitter deep within a faceted dark-light reflector with a 45° mechanical shielding angle, direct line-of-sight to the luminous diode is physically blocked from normal room viewing angles.
Key Engineering Takeaways
- 45° shielding angle keeps the ceiling plane visually serene and glare-free.
- Dark-light specular reflectors achieve Unified Glare Rating (UGR) below 10.