Abstract
A need for indoor facilities for sunbathing during bad weather has been suggested by hoteliers. A survey of natural conditions and the main photobiological effects of sunbathing has been made and a trial based on the observations carried out. Indirect lighting provided a blue 'sky', sunlight was simulated by directional lighting, and the main photobiological irradiation was supplied by independently controlled u.v. sources. The data obtained were applied to a full-scale trial in a 40 ft airhouse; the skin sensitivity and user reaction of seventy-five volunteers were studied and basic design parameters were deduced. Using these data two indoor solaria have been constructed in the UK. Details of the installations and customer reactions are given.
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