The requirements for shielding and filtering light emission from outdoor light fixtures shall be as set forth in the following table.
Fixture Lamp Type | Shielded | Filtered |
Fixture Lamp Type | Shielded | Filtered |
Fluorescent | Fully | Yes |
Fossil fuel | None | None |
Glass tubes filled with neon, argon, krypton | None | None |
High pressure sodium | Fully | None |
Incandescent greater than 150W | Fully | None |
Low pressure sodium | Partially | None |
Mercury vapor | Fully (7) | Yes |
Metal halide (6) | Fully | Yes |
Quartz (3) | Fully | None |
Other sources | As approved by the Building Inspector | |
Footnotes: 1. This is the preferred light source to minimize undesirable light into the night sky affecting astronomical observations. 2. Warm white and natural lamps are preferred to minimize detrimental effects. 3. For the purposes of this chapter, quartz lamps shall not be considered an incandescent light source. 4. Most glass, acrylic, or translucent enclosures satisfy these filter requirements. 5. Outdoor advertising signs of the type constructed of translucent materials and wholly illuminated from within do not require shielding. 6. Metal halide display lighting shall not be used for security lighting after 11:00 p.m. (or after closing hours if before 11:00 p.m.) unless fully shielded. Metal halide lamps shall be in enclosed luminaries. 7. Recommended for existing fixtures. The installation of mercury vapor fixtures in prohibited effective 90 days after the date of adoption of this chapter. | ||
(Prior Code, § 19-3-3)