Angle 21 is targeted at the privacy market, but it could be used to maintain view and diffuse sunlight entering from above the horizontal. Currently, light from core daylighting systems is usually directed into a space by large diffusers that descend below the ceiling plane. Smaller diffusers and hollow light guides that resemble ordinary luminaires are also available. It is reasonable to expect that these systems will have light distributions and glare control similar to those of standard luminaires. However, most manufacturing efforts have gone into producing systems that efficiently collect light and transmit it through the building.
More work is needed to produce effective methods of directing light to the work surface.
In addition, according to Steve Selkowitz of the Windows and Daylighting Group at Lawrence Berkeley Laboratory, the industry needs to seamlessly integrate component technologies into functional systems for optimal building performance. Daylighting systems, electric lighting systems, and controls need to be coordinated to optimize glare control, light balance, and energy savings. Backup electric lighting needs to be incorporated into the system so the changeover from day to night is seamless. And specifiers want greater reliability for dimming systems. However, there is no reason why daylighting systems cannot become part of the building industry standard.