A luminaire light distribution is designated as cutoff when the candlepower per 1,000 lamp lumens does not numerically exceed 25 (2.5 percent) at an angle of 90 degrees above nadir (horizontal), and 100 (10 percent) at a vertical angle of 80 degrees above nadir. Cutoff type luminaires usually have flat glass lenses. Cutoff ratings have been replaced with BUG (Backlight, Uplight, Glare) ratings by the IES.