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Credit: J. Muhs, ORNL, redrawn by NREL. Fig. 3.3.1-1 Illustration showing the use of hybrid solar lighting to illuminate an indoor space with natural sunlight. In the United States, artificial lighting represents the single largest component of electricity use in commercial buildings and costs building owners nearly $17 billion a year. Despite the high energy consumption and the continued demand by occupants for more natural lighting, natural lighting from conventional options, such as skylights and windows, illuminates only a tiny fraction of the available commercial space. This limited use of natural lighting results from the architectural limitations of skylights and windows and the uncontrollable nature of the sunlight itself (i.e., it fluctuates in intensity and can be highly directional, producing glare and unwanted heating). A significant market exists for a natural lighting product that can offer the benefits of natural lighting with all of the conveniences and control of an artificial lighting system. The HSL technology can meet this need and can potentially provide a product with an economic payback of 3 to 4 years for commercial buildings in the Sunbelt regions worldwide. In the U.S. Sunbelt alone, 20 billion ft2 of commercial space exist that meet the requirements for implementing an HSL system. Each year, this applicable space grows by 600 million ft2 of new construction. Commercializing the HSL technology will initially focus on a small subset of retailers representing the jewelry, furniture, and apparel markets. This niche market of early adopters is expected to increase sales volumes of the HSL technology, permitting cost reductions through economies of scale. Reduced system prices should anticipate great market penetration into other niche markets and the larger commercial building market, which includes office buildings. HSL delivers the benefits of natural lighting without the disadvantages of conventional daylighting technologies such as windows or skylights. Skylights have been around for many decades and function as a simple means of bringing natural light into a building; however, they can have some of the following drawbacks that can limit their application: significant source of heat loss or heat gain, can constrain design of building shape and orientation, difficult\complicated to specify, point of condensation, uncontrolled and uneven illumination, susceptible to water leakage, susceptible to ventilation leakage, not appropriate for low ceilings, difficult to relocate or reconfigure, suitable for downlighting only (i.e., not applicable for directional lighting or uplighting), does not maximize the use of available sunlight, source of light pollution at night, cannot easily be turned off, and security concerns. 80PDF Image | Concentrating Solar Power
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