Outdoor Lighting in Islip, NY (2026)
3 verified outdoor lighting rules for Islip, New York, sourced directly from the municipal code and official government pages.
Verified from official government sources
Dark Sky Rules
Islip's Exterior Lighting Standards article, adopted to protect the ability to view the night sky, requires full cutoff luminaires for fixtures rated 1,800 lumens or more and fully shielded fixtures for anything dimmer, with all luminaires directed downward and capped at 20 feet in mounting height.
Islip Full Cutoff Dark-Sky Lighting Rule
Some RestrictionsCode of the Town of Islip § 68-685D
All exterior lighting rated to be lamped at 1,800 lumens (100 watts incandescent) and greater shall use full cutoff luminaires, as determined by photometry test or certified by the manufacturer, and installed as designed with the light source directed downward. All exterior lighting 1,800 lumens (100 watts incandescent) and less shall use fully shielded fixtures and shall be installed as designed.
Light Trespass & Shielding
Islip's exterior-lighting article sets a hard numeric ceiling on light trespass: no more than 0.05 footcandle, measured horizontally on the ground or vertically five feet up, at any property line adjoining a residential parcel or public right-of-way. Between two commercial properties the cap doubles to 0.1 footcandle.
Islip Caps Light Trespass at 0.05 Footcandles
Some RestrictionsCode of the Town of Islip § 68-687
No luminaire shall be located or concentrated so as to produce glare or direct illumination across the boundary property line, nor shall any such light be of such intensity as to create a nuisance or detract from the use and enjoyment of adjacent property. ... The maximum illuminance at or beyond the property line that adjoins a residential parcel or public right-of-way may not exceed 0.05 fc h...
Billboard Lighting
Islip's Conservation of Energy ordinance bars lighting up any sign, billboard or outdoor display after the close of business or 10:00 p.m., whichever is later. Town Code § 11-4 also stops moving electric signs and most outdoor-area lighting after that same cutoff.
Islip Bans Illuminated Signs After 10 PM
Some RestrictionsCode of the Town of Islip § 11-4(A)
It shall be unlawful for any person to cause, allow or permit the illumination or lighting of any sign after the close of business or 10:00 p.m., whichever is later.
Looking for Suffolk County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Islip city rules.
Outdoor Lighting in Suffolk County →