§ 27.12. Glare.
(a) Diffusing accessories. Lamps producing glare in the ordinary field of vision from any position at which work is performed, or such lamps located in traversed spaces in buildings, shall be provided with shades, reflectors, diffusing glassware or other accessories, installed and arranged in such manner as to minimize glare. The devices shall be made of substantial construction and made of nonflammable material.
(b) Exceptions. The requirements of subsection (a) do not apply to lamps used for a temporary decorative purpose if an unusual or harmful glare is not created.
(c) Natural light. Natural light, when it is used for illumination, shall be so distributed as to avoid glare.
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