Increasing the use of natural daylight for lighting purposes in buildings can offer large savings in electricity usage, up to 20-30/100 of total building energy consumption. One solution is the use of lightpipes that can not only bring light into otherwise inaccessible or dimly lit places, but also improve the internal environment without generating excessive heat. The performance of six light pipes has been monitored in three different areas, a workshop, a residential landing, and a small office. The highest illuminance was 1538 lux, obtained underneath the straight lightpipe n the landing, with an aspect ratio of 2.1. The lowest was 41 lux in the darkest corner of the workshop.
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