Lighthouse illumination involves using optical apparatus to collect the greatest possible number of rays from a flame[1]. The goal is to direct the rays to certain parts of the horizon and the sea[1]. This can be done by using glass lenses, metallic reflectors or a combination of both[1].
The source of light should produce a flame of constant intensity, and be of the smallest possible bulk[1]. By directing the light, hidden dangers are converted into sources of safety for sailors[1].
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