These data represent a single view window with 4 skylights (2’ x 2’) translucent (light diffusing) skylights with a 50% visible light transmission (Tvis) representing 1.6% of the floor area. The ceiling is 10’ tall. The floor area above 300 lux is 20%.

These data represent a single view window with 4 skylights (4’ x 4’) representing 6.4% of the floor area. The ceiling is 10’ tall. The floor area above 300 lux is 100%.

These data represent a single view window with 4 moderately sized skylights (3’ x 3’) representing 3.2% of the floor area, set within a 16’ tall cruciform ceiling grid. The floor area above 300 lux is 25%.

These data represent a single view window with 4 skylights (2’ x 2’) representing 1.6% of the floor area, set within a 16’ tall cruciform ceiling grid with sloping t-bar trays. The sloped ceilings improve the distribution of light from the skylights and increase the visual perception of brightness while minimizing shadows. The floor area above 300 lux is 15%.

These data represent a single view window with 4 skylights (4’ x 4’) representing 6.4% of the floor area, set within a 16’ tall cruciform ceiling grid with sloping t-bar trays. The sloped ceilings improve the distribution of light from the skylights and increase the visual perception of brightness while minimizing shadows. The floor area above 300 lux is 100%.

These data represent a single view window with a single skylight (4’ x 8’) representing 3.2% of the floor area, set within a 16’ tall ceiling with sloping t-bar trays. The sloped ceilings improve the distribution of light from the skylights and increase the visual perception of brightness while minimizing shadows. The floor area above 300 lux is 40%.

These data represent a single view window with a single skylight (6’6” x 10’) representing 6.4% of the floor area, set within a 16’ tall ceiling with sloping t-bar trays. The sloped ceilings improve the distribution of light from the skylights and increase the visual perception of brightness while minimizing shadows. The floor area above 300 lux is 90%.

These data represent a single view window with a single skylight (6’6” x 10’) representing 6.4% of the floor area, set within a 16’ tall ceiling with sloping t-bar trays, with an translucent reflector hung below the skylight. The sloped ceilings improve the distribution of light from the skylights and increase the visual perception of brightness while minimizing shadows. The reflector is intended to decrease the illumination directly below the skylight, redirect the brightness onto the sloped ceiling and walls, and minimize the line of sight to the skylight aperture for students seated within the classroom, thus reducing the potential for glare. The floor area above 300 lux is 55%.

These data represent a single view window with a single skylight (6’6” x 10’) representing 6.4% of the floor area, set within a 16’ tall ceiling with sloping t-bar trays, with an translucent reflector hung below the skylight. An opening has been cut in the center of the reflector to allow a selected portion of the daylight to penetrate directly below the skylight. The sloped ceilings improve the distribution of light from the skylights and increase the visual perception of brightness while minimizing shadows. The reflector is intended to decrease the illumination directly below the skylight, redirect the brightness onto the sloped ceiling and walls, and minimize the line of sight to the skylight aperture for students seated within the classroom, thus reducing the potential for glare. The floor area above 300 lux is 60%.

These data represent a single view window with a single skylight (6’6” x 10’) representing 6.4% of the floor area, set within a 16’ tall ceiling with sloping t-bar trays, with an flat staggered aluminum reflector hung below the skylight. The sloped ceilings improve the distribution of light from the skylights and increase the visual perception of brightness while minimizing shadows. The reflector is intended to decrease the illumination directly below the skylight, redirect the brightness onto the sloped ceiling and walls, and minimize the line of sight to the skylight aperture for students seated within the classroom, thus reducing the potential for glare. The floor area above 300 lux is 75%.

These data represent a single view window with a single skylight (8’ x 12’) representing 9.6% of the floor area, set within a 16’ tall ceiling with sloping t-bar trays, with an angled and staggered aluminum reflector hung below the skylight. The sloped ceilings improve the distribution of light from the skylights and increase the visual perception of brightness while minimizing shadows. The angled reflector is intended to decrease the illumination directly below the skylight, redirect the brightness onto the sloped ceiling and walls, and minimize the line of sight to the skylight aperture for students seated within the classroom, thus reducing the potential for glare. The floor area above 300 lux is 95%.

These data represent all three cases that reached 100% of the floor area that exceeded the target criteria. The side by side comparison is useful to compare the qualitative differences for alternative design solutions that all achieve the same illumination performance criteria. The solution on the far left has arguably the highest lighting contrast with the shallow skylight wells revealing large bright surfaces within the visual field and a relatively dark ceiling. The middle solution has lower contrast due to the large sloped skylight wells that are washed in daylight. The solution on the far right has the brightest ceiling plane due to the wide sloping ceiling planes that meet at the well of the skylight and due to the intricate daylight reflector and diffuser hanging below the skylight. The diffuser serves to dampen the daylight directly below the skylight well, minimize the direct line of sight to the bright surfaces of the skylight itself, and redirect light toward the walls of the classroom.