Free Shipping & Free Returns More Like This Kinney Blue Ceramic Gourd LED Table Lamp. In conclusion, the assessment of discomfort glare from non-uniform light sources with UGR calculated from luminance maps is questioned. Bodie Lantern Night Light LED Table Lamp with USB Port 179.99. For example, an LED bulb with a CCT of 5000K glows in the same color as a black. The UGR calculated from luminance maps is compared with the original UGR from the luminous intensity distribution and the UGR developed for small light sources. A comprehensive lighting glossary with common lighting terminology and. For non-uniform light sources, the UGR value is strongly dependent on the combination of the individual pixels and differences of up to 17.3 UGR units for the same luminaire are obtained. For uniform light sources, the UGR is independent of the division of the luminance map.
Individual pixels of a luminance map can be considered as individual light sources or they can be combined to form larger sources. In the present paper, the UGR formula is calculated alternatively from the luminance distribution. With a growing market share of LED luminaires for interior lighting, a better assessment of discomfort glare from non-uniform light sources becomes essential. LED luminaires often exhibit a non-uniform luminance distribution with alternating areas of high and low luminance.
UGR is valid for a wide range of uniform light sources but the assessment of discomfort glare from non-uniform luminaires with current glare indices is questioned. You can achieve 500 lux for your workspace with a 1,000 lumen desk light. In Europe, discomfort glare for interior lighting installations is assessed with the Unified Glare Rating (UGR). To achieve office lighting of 300 lux, an LED lamp should be at least 600 lumens.
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