01361nas a2200145   4500008004100000050001400041245009700055210006900152260003100221520081700252100002101069700002501090700002701115856007301142       1996                        eng d  aLBL-3813100aDemonstration of a Light-Redirecting Skylight System at the Palm Springs Chamber of Commerce0 aDemonstration of a LightRedirecting Skylight System at the Palm   aPacific Grove, CAc08/19963 a<p>As part of a demonstration project to provide a comprehensive energy upgrade to a 294 m<sup>2</sup> (3168 ft<sup>2</sup>) commercial building, an advanced skylight design was developed using optical light control materials and geometry to provide daylight to two adjoining offices. The skylight system was developed using outdoor physical model tests and simulation tools Limited on-site measurements and occupant polls were conducted. Market issues were addressed. The skylight systems were found to improve lighting quality and to control excessive daylight illuminance levels compared to a conventional diffusing bubble skylight. Daylighting principles developed in earlier work for vertical glazing systems (light shelves and light pipes) were shown to be applicable in skylight designs at full-scale.</p>1 aLee, Eleanor, S.1 aBeltran, Liliana, O.1 aSelkowitz, Stephen, E.  uhttps://facades.lbl.gov/publications/demonstration-light-redirecting01829nas a2200157   4500008004100000050001400041245011000055210006900165260002600234520122600260100002501486700002101511700003401532700002701566856007801593       1994                        eng d  aLBL-3445800aThe Design and Evaluation of Three Advanced Daylighting Systems: Light Shelves, Light Pipes and Skylights0 aDesign and Evaluation of Three Advanced Daylighting Systems Ligh  aSan Jose, CAc06/19943 a<p>We present results from the design and evaluation of three advanced daylighting systems: a light shelf, a light pipe, and a skylight. These systems use optical films and an optimizedsgeometry to passively intercept and redirect sunlight further into the building. The objectives of these designs are to increase daylighting illuminance levels at distances of 4.6-9.1 m (15-30 ft) from the window, and to improve the uniformity of the daylight distribution and the luminance gradient across the room under variable sun and sky conditions throughout the year. The designs were developed through a series of computer-assisted ray-tracing studies, photometric measurements, and observations using physical scale models. Comprehensive sets of laboratory measurements in combination with analytical routines were then used to simulate daylight performance for any solar position. Results show increased daylight levels and an improved luminance gradient throughout the year - indicating that lighting energy consumption and cooling energy due to lighting can be substantially reduced with improvements to visual comfort. Future development of the designs may further improve the daylighting performance of these systems.</p>1 aBeltran, Liliana, O.1 aLee, Eleanor, S.1 aPapamichael, Konstantinos, M.1 aSelkowitz, Stephen, E.  uhttps://facades.lbl.gov/publications/design-and-evaluation-three-advanced