Some recommendations I would like to propose...
Ill do the markup in sections so its easier to discuss.
strikeout for text to omit, ALL CAPS for new language to be included. (My comments in
Red)
Section 65.090 Outdoor Lighting 131
65.090-A Applicability and Exemptions
The outdoor lighting regulations of this section apply to all outdoor lighting installed after the effective date specified in Section 1.030, except that they do not apply to any of the following:
1. EXISTING Outdoor lighting on lots occupied by residential buildings
containing fewer than 4 dwelling units;
(no reason for this exemption; new or replacement lights should be conforming).
2. EXISTING Public street lights;
(Any new or replacement lighting should be conforming...the city should be setting the good example).3. Airport runway and aviation safety lights required by the FAA (e.g., warning lights on towers and tall buildings);
(this is covered by federal law and not within city jurisdiction)4. Lighting of official government flags, PROVIDED NARROW SPOTLIGHTING IS CONTAINED WITHIN THE AREAS EACH FLAG OCCUPIES;
(spotlighting should be used in lieu of floodlighting for better control of spill and glare)5. Outdoor lighting used exclusively for AND DURING public recreational activities, sporting events at stadiums and ball fields or other outdoor public spaces or venues, PROVIDED THEY DO NOT CREATE A NUISANCE OR HAZARD;
6. Outdoor lighting used for emergency equipment and TEMPORARY work conducted in the interest of law enforcement or for public health, safety or welfare;
7. Outdoor lighting used for a temporary event lasting no more than 10 days;
(adjust for State Fair and similar venues) 8. Temporary holiday light displays; and
9. Lighting fixtures with a light output less than 1000 Lumens.
(mom and pops 60w porch light is safe, barring any complaints)65.090-B General Standards
All outdoor lighting must comply with the following general standards:
1. Safety Lighting must provide sufficient and safe illumination for motorized and non-motorized circulation on the subject lot. (This section fails to define "sufficient and safe illumination" and may counter-productively compel the addition of lighting systems where none were legally required or needed.).
STREET LIGHTING SHALL NOT BE REQUIRED, BUT WHERE DESIRED, ILLUMINATION LEVELS SHALL CONFORM TO NATIONALLY RECOMMENDED VALUES, AS DEFINED BY THE ILLUMINATING ENGINEERING SOCIETY OF NORTH AMERICA (IESNA).
ILLUMINATED RESIDENTIAL STREETS WITH LOW PEDESTRIAN CONFLICT SHALL HAVE A MAINTAINED AVERAGE ILLUMINANCE LEVEL OF 0.3 FOOTCANDLES; ILLUMINATED MAJOR STREETS WITH HIGH PEDESTRIAN CONFLICT (EXCLUDING ENTERTAINMENT DISTRICTS) SHALL HAVE A MAINTAINED AVERAGE ILLUMINANCE LEVEL OF 1.2 FOOTCANDLES
(IES publication RP-8-00 "American National Standard Practice For Roadway Lighting" pp5-8 tables 1,2)WHEN LIGHTING OF PUBLIC PLACES OR RIGHT-OF-WAYS IS DESIRED, IT SHALL BE BY MEANS OF STEADY WHITE LIGHT, DEFINED AS HAVING A CORRELATED COLOR TEMPERATURE BETWEEN 2700 AND 3200 DEGREES KELVIN (2700K-3200K). NEW AND EXISTING INSTALLATIONS OF HIGH-PRESSURE SODIUM (HPS) ARE ALSO PERMITTED.
Blue-rich light sources (over 3,200K) shall not be used for street illumination, nor shall Monochromatic light sources (such as Low-Pressure Sodium).Figure 65-1: Required Shielding
21. Canopy-Mounted Lights
Canopy lighting must be by recessed fixtures
with diffusers that WHERE NEITHER THE LAMP(S), REFLECTOR, REFRACTOR, NOR FOCUSING OR DIFFUSING OPTICS
do not extend below the canopy surface. SUCH FIXTURES ARE COMMONLY REFERRED TO AS "FULL CUTOFF" OR "FULLY SHIELDED."
32. Shielding
Light sources must be concealed or shielded with cutoffs so that no more than 2.5% of the light emitted directly from the lamp or
indirectly from the fixture is projected at an angle of more than 90 degrees above nadir and no more than 10% of the light emitted
directly from the lamp or indirectly from the fixture is projected at an angle of more than 80 degrees above nadir.
IN AREAS WHERE STREET LIGHTING IS DESIRED, ALL NEW OR REPLACEMENT LUMINAIRES (FIXTURES) WITH A LIGHT OUTPUT OVER 1000 LUMENS INTENSITY MUST BE SHIELDED IN SUCH A WAY THAT NO LIGHT EMITTED DIRECTLY FROM THE LAMP OR INDIRECTLY FROM THE FIXTURE IS PROJECTED AT AN ANGLE OF MORE THAN 90 DEGREES ABOVE NADIR AND NO MORE THAN 10% OF THE LIGHT EMITTED DIRECTLY FROM THE LAMP OR INDIRECTLY FROM THE FIXTURE IS PROJECTED AT AN ANGLE OF MORE THAN 80 DEGREES ABOVE NADIR. SUCH FIXTURES ARE COMMONLY DESCRIBED AS 'FULL CUTOFF'
This is a variation of the IESNA Luninaire Cutoff Classification known as "Cutoff" (CO), which is less strict than "Full Cutoff" (FCO). To qualify as Full Cutoff, zero light is allowed above 90 degrees. (American National Standard Practice for Roadway Lighting, ANSI/IESNA RP-8-00, p.6)
Typical street lighting in Tulsa falls under the "Semi-Cutoff" (SCO) or "Non-Cutoff" (NC) categories where there is little or no intensity limits for "glare zone" or uplight, so requiring either CO or FCO luminaires would be a vast improvement over what we have now.
"Nadir" means the ground directly below the fixture.http://www.holophane.com/led/fco-utility/gfx/cutoffs.jpg4. Spillover Light
Illumination LIGHT TRESPASS along the lot line of the subject property may not exceed
0.5 0.25 footcandles when abutting an agricultural or residential zoning district OR RESIDENTIAL ROADWAY and may not exceed 3.0 foot-candles when abutting any other zoning district or public right-of-way. Maximum illumination levels are measured 3 feet above grade or from the top of any OPAQUE, PERMANENT screening fence or wall along the property line.
This is an adaptation of the "Kennebunkport Formula," which is a tool designed to help developers and property owners plan lighting systems that adaquately serve their needs while respecting the property rights of their neighbors.
The formula
H = 3 + (D/3) or inversely, D = 3(H-3)
describes the calculation necessary to light with minimal waste beyond the intended area.
Where:
H = height of fixture,
D = distance to fixture from a property line
Example 1: Symmetrical fixture 15-ft inside a property line would be mounted at 8 ft.
Example 2: Symmetrical fixture atop a 15-ft pole should be 36 ft inside a property line.
Example 3: Symmetrical fixture atop a 30-ft pole should be 81 ft inside a property line.
The Kennebunkport Formula assumes use of symmetrical Full-Cutoff Optics (FCO) fixture with a common optical cutoff slope of 70 degrees, allowing planners and architects more realistic choices in specifying mounting height based on optical performance (rather than arbitrary pole height limitations that may hamper effective lighting design).
The fixtures MUST be shielded for this to work. A typical, unmodified PSO leased "security light" (NEMA) would not have the cutoff necessary.
RESIDENTIAL ROADWAY should be added because there are usually residences across them that would definitely notice the intrusion of 3 footcandles (about three side-by-side 100W sodium residential streetlights)