125 OUTDOOR LIGHTING REGULATIONS
REQUIREMENTS FOR SHIELDING AND FILTERING | ||
|---|---|---|
Fixture Lamp Type | Shielded | Filtered4 |
Low pressure sodium1 | Partially | None |
High pressure sodium | Fully | None |
Metal halide6 | Fully | None |
Fluorescent | Fully5 | Yes2 |
Quartz3 | Fully | None |
Incandescent greater than 150 W | Fully | None |
Incandescent 150 W or less | None | None |
Mercury vapor | Fully7 | Yes7 |
Fossil fuel | None | None |
Glass tubes filled with neon, argon, krypton | None | None |
Other sources | As approved by the town building inspector | |
Notes: |
|---|
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 code, 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 is prohibited effective 90 days after the date of adoption of this code. |