Derby Downtown Lighting & Signage Plan
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
07<br />
Glossary<br />
DEFINITIONS<br />
• BUG Rating - A rating system that classifies luminaire performance based on how much light comes out of the back, top (uplight), and front<br />
(glare) of the fixture. Additionally, the angle at which this light comes out of the fixture is measured in order to further classify the luminaires.<br />
• Color Rendering Index - A metric indicating how accurately a light source renders color.<br />
• Color Temperature - A metric that quantifies the color or perceived ‘whiteness’ of a light source. Color temperature is measured in degrees<br />
Kelvin (K).<br />
• Footcandle - A unit which measures the illuminance cast on a surface by a one-candela source one foot away.<br />
• Illuminance - The amount of light sriking a surface.<br />
• Luminaire - A complete electric light fixture.<br />
• Uniformity Ratio - The ratio of the maximum to minimum illuminance on a surface. Low uniformity ratios indicate the<br />
surface is receiving a very even amount of light.<br />
• Vertical Illumination - Light that falls on the vertical planes of a room or building.<br />
<strong>Derby</strong> <strong>Lighting</strong> & <strong>Signage</strong> <strong>Plan</strong><br />
145
Change language