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Lastest Articles
How to Audit a Municipal Streetlight Network Before an LED Conversion
A municipal streetlight audit is a reconciled record of each light, who owns it, how it is billed and maintained, and what field conditions could affect a conversion. Before selecting LED equipment, a city or agency should compare its records with field observations and document what is verified, uncertain, or in need of qualified review.
How Ambient Temperature Affects LED Streetlight Output and Service Life
Ambient temperature affects an LED streetlight by changing how readily the luminaire can release internally generated heat. Hot conditions can raise LED and driver operating temperatures, accelerating lumen depreciation and stressing components, while cold conditions generally favor LED thermal performance but still require verified low-temperature and cold-start ratings.
LM-80 and TM-21 for Streetlights: What the Test Results Do and Do Not Prove
LM-80 measures luminous-flux and color maintenance for LED packages, arrays, or modules under stated test conditions; TM-21 projects longer-term luminous-flux maintenance from applicable source data. For a streetlight claim based on LM-80 and TM-21, neither method alone proves how long the complete luminaire will operate without failure.
How to Read an IES File Without Relying Only on a Photometric Rendering
A reliable IES file interpretation starts by verifying the luminaire and test identity, decoding the vertical and horizontal angle lists, and matching each candela series to its measurement plane. After that, compare the raw data with the polar plots and the project-specific roadway model rather than accepting a rendering as the whole analysis.
Veiling Luminance and Threshold Increment: Measuring Disability Glare on Roads
Veiling luminance describes the contrast-reducing luminous veil caused by stray light in the eye, while threshold increment expresses how much more contrast is needed to see a target when glare is present. Together, veiling luminance and threshold increment help engineers evaluate roadway disability glare, but the results are meaningful only when the governing method and its assumptions are identified.
Roadway Lighting Uniformity Ratios: Why Average Light Levels Can Be Misleading
Learn how to calculate roadway lighting uniformity ratios, compare average and minimum illuminance, and properly review streetlight photometric plans.
Integrated EV Charging, BESS, Solar and Site Lighting into One Energy Plan
An integrated EV charging, BESS, solar, and site lighting plan treats these assets as one operating system rather than four separate purchases. For a municipal, fleet, public-parking, or transportation-facility site, begin with load profiles, service priorities, utility constraints, and operating ownership before deciding what equipment is feasible.
EV Charging Demand Charges: How Site Operation Affects the Electricity Bill
EV charging demand charges can affect a site’s electricity bill when its tariff includes a charge tied to the highest measured demand during a billing period. Charging schedules, simultaneous sessions, and other facility loads can influence that peak, but the applicable utility tariff, meter interval, and site conditions determine the actual bill.
Floodlighting Beam Angle Guide: How to Select and Aim Floodlights
A floodlighting beam angle is only one input: start with the task area, then test the actual luminaire photometry against mounting height, setback, and aiming direction. Beam angle alone cannot confirm coverage, glare control, structural suitability, or compliance with a local requirement.
BABA vs. Buy American: What Public Lighting Buyers Need to Distinguish
This BABA vs. Buy American guide explains why Build America, Buy America (BABA) and the Buy American Act are not interchangeable. For a public-lighting purchase, the right starting point is the award or solicitation: confirm the funding path and clauses, then evaluate the exact item and the documentation required for that project.
How to Write an Ecological Lighting Specification for Public Projects
An ecological lighting specification defines the site, sensitive habitats, required lighting tasks, and verifiable limits on direction, spectrum, output, timing, and maintenance. For a public project, it should require bidders to show how the proposed equipment and controls meet those requirements while leaving final design values to the responsible engineer and applicable authority.
Coastal Streetlight Corrosion: Selection and Maintenance Guide
Coastal streetlight corrosion is best managed as an installed-assembly and maintenance decision, not as a single material label or salt-fog hour count. For a roadway luminaire near salt water, agencies should evaluate the local exposure, housing and finish, fasteners and interfaces, seals and drainage, documentation, and the plan for inspection and repair.
Streetlight Carbon Reporting: How Cities Calculate CO2e
Streetlight carbon reporting starts with a city pairing documented electricity use in kilowatt-hours (kWh) with a documented, applicable electricity emission factor. A credible streetlight carbon report also records its asset boundary, data gaps, factor vintage, and baseline so readers can tell an inventory from an estimate of avoided emissions.
Environmental Product Declarations (EPD) for Luminaires: What Buyers Should Look For
A luminaire EPD, short for an Environmental Product Declaration, is a verified Type III environmental declaration that reports life-cycle environmental information for a defined product or product group under stated rules. It can inform a roadway-lighting procurement, but it is not a performance certification or proof that one luminaire is environmentally preferable to another.
Embodied Carbon vs. Operational Carbon in Roadway Lighting
Embodied Carbon vs. Operational Carbon! What are the differences in Roadway Lighting?
Embodied carbon is associated with making, delivering, installing, replacing, and eventually managing the end of life of roadway-lighting equipment within a defined assessment boundary.
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