good links arseegee, this looks like a fashion/function compromise....
[Linked Image from baselite.com]

Chris, here it it..

Quote
547.8 Luminaires (Lighting Fixtures).
Luminaires (lighting fixtures) shall comply with the following.
(A) Minimize the Entrance of Dust. Luminaires (lighting fixtures) shall be installed to minimize the entrance of dust, foreign matter, moisture, and corrosive material.
(B) Exposed to Physical Damage. Any luminaire (lighting fixture) that may be exposed to physical damage shall be protected by a suitable guard.
(C) Exposed to Water. A luminaire (fixture) that may be exposed to water from condensation, building cleansing water, or solution shall be watertight.