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Other Solar Technologies

Solar Lighting

A solar lighting system channels the outdoor natural sunlight for interior lighting purpose, whenever sunlight is available. Typically, a solar lighting system comprises of a sunlight concentrator, light transmission device (e.g. optical fibers) and an indoor lighting fixture. The sunlight concentrator is mounted outdoors or on the roof of a building to collect sunlight. Its performance can be enhanced by the incorporation of sun-tracking devices or optical concentrating devices. The light collected is then channeled down via the light transmission devices to a lighting fixture. For some types of solar lighting systems, UV and infra-red light filters are installed to filter out UV and to reduce the amount of heat transferred to the indoor environment.

There are still application limitations associated with solar lighting. Light transmission distance is often limited due to attenuation within the light transmission device. Lighting intensity fluctuates with the natural sunlight. Systems are being developed to use artificial lighting to compensate for the fluctuations.

A number of solar lighting devices are available in the market. Most of such devices have not been used nor tested for suitability for use in Hong Kong, China. Examples of some of these devices are given below only for illustration purpose:

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