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Street Lights & Cobraheads

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LED Street Lights Matched to Street Class and Pole Height

Municipal buyers and site contractors do not shop street lights by wattage; they spec by roadway class, pole height, and distribution type. That is the language this page uses. Every cobrahead here maps to a street class, so a DOT spec sheet or a private roadway plan translates directly to a fixture selection.

Street ClassTypical Pole HeightLumen PackageTypical LED Wattage
Local and residential streets15 to 25 ft3,000 to 9,000 lm30 to 70W
Collector streets, campus drives25 to 35 ft9,000 to 20,000 lm70 to 150W
Arterials and multi-lane roadways35 to 45 ft and up20,000 to 40,000 lm150 to 300W
Pedestrian pathways and lanes12 to 15 ft2,000 to 5,000 lm20 to 40W

Treat the table as a planning starting point; final packages come from the photometric layout against the project's light level and uniformity targets. Product pages carry IES files for exactly that purpose.

IES Distribution Types: II, III, and V in Plain Terms

The distribution type describes the shape of light the optic throws, and choosing it correctly matters more than raw lumens. Type II casts a long, narrow pattern for lanes and narrow local streets, keeping light on the pavement rather than in adjacent yards. Type III pushes light forward and wide, the default for wider roadways and the pole rows of parking areas. Type V throws a symmetrical circular or square pattern for intersections, plazas, and interior parking positions where light is needed on all sides of the pole. When a street lamp replacement underperforms, a wrong distribution type is a more common cause than insufficient wattage.

Photocells, NEMA Receptacles, and Shorting Caps

Most cobraheads ship with a twist-lock NEMA receptacle on top. A 3-pin receptacle handles basic dusk to dawn photocell control. A 7-pin receptacle adds contacts for dimming and networked controls, which is what municipalities spec when smart-city nodes or adaptive dimming are in the plan, even if the controls come later. If a fixture switches from a breaker or contactor instead of its own photocell, install a shorting cap in the receptacle to close the circuit. Buyers filtering on receptacle type will find it called out on product pages, along with button photocell options for standalone installations.

Replacing HPS and Metal Halide Street Lights

LED street lights replace high pressure sodium and metal halide cobraheads at a fraction of the input watts while improving color rendering from the orange HPS glow to 70+ CRI white light, which reads better on camera systems and to drivers. Slip-fitter mounts fit standard horizontal mast arms, typically clamping a 2-inch (2-3/8 in OD) tenon, so most retrofits reuse the existing arm and pole. Fixtures here carry IK-rated impact resistance, IP65 or IP66 sealed optics, and surge protection sized for pole-top exposure; most lines are DLC listed, and light pole lighting projects routinely qualify for utility rebates on the fixture swap.

Complete the Site Package

Pair cobraheads with Light Poles and Accessories for steel, aluminum, and fiberglass mounting, or step over to Area Lights and Shoebox Fixtures for parking field geometry. The Area & Site Lighting parent covers the full exterior site scope, Post Lights handle decorative roadway and walkway poles, and Outdoor Flood Lights fill perimeter and facade gaps in the site plan.

Frequently Asked Questions

A cobrahead is the standard roadway fixture whose arched profile resembles a cobra's hood: a slip-fitter mount that clamps onto a horizontal mast arm, an optical assembly aimed at the roadway, and typically a twist-lock photocell receptacle on top. Originally built around HPS and metal halide lamps, cobraheads are now overwhelmingly LED, and the form factor remains the default for municipal streets, private roadways, and campus drives.

Match the pattern to the geometry. Type II throws a long, narrow pattern suited to lanes and narrow local streets. Type III pushes light forward and wide for broader roadways and parking rows along a curb line. Type V distributes symmetrically around the pole for intersections, plazas, and interior parking positions. Run the fixture's IES file in a photometric layout to confirm coverage and uniformity before ordering.

Most 250 watt HPS cobraheads are replaced by LED fixtures in roughly the 90 to 150 watt range, but match on delivered lumens and distribution type rather than a wattage rule of thumb. LED optics put more light on the pavement with less waste, so a photometric comparison using the fixture's IES file against the existing pole spacing is the reliable method. Product cut sheets list lumen packages for exactly this comparison.

A 3-pin twist-lock receptacle supports a standard dusk to dawn photocell: line, load, and neutral. A 7-pin receptacle adds low voltage contacts for dimming and networked control nodes, which lets a municipality install smart-city controls or adaptive dimming later without touching the fixture. Many agencies now spec 7-pin as future-proofing even when the initial install only uses a basic photocell.

Whenever the fixture has a photocell receptacle but the switching happens elsewhere, such as a contactor, time clock, or utility-controlled circuit. The shorting cap closes the receptacle circuit so the fixture receives power, and it keeps the receptacle sealed against weather. Without it, a fixture wired through an empty receptacle will not light. Caps are inexpensive and typically ordered one per fixture on centrally switched runs.

Frequently, yes. Roadway and area lighting retrofits are a standard rebate measure, and most programs require an active DLC listing for the specific fixture model. The majority of cobrahead lines in this catalog are DLC listed, with listing numbers, cut sheets, and IES files on the product pages, which covers the documentation a rebate application and utility pre-approval typically require.

Most LED cobraheads use a slip-fitter that clamps a standard 2-inch pipe tenon, about 2-3/8 inches outside diameter, on a horizontal mast arm, so typical retrofits reuse the existing arm and pole. Verify the tenon diameter, arm orientation, and fixture weight against the pole's rating, and check the fixture's leveling adjustment range if arms are tilted. For new pole packages, see the light poles category.