Guides
Practical answers for people who buy and specify outdoor and industrial lighting, written by the engineers who build it — plus a weekly market brief.
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Solar Street Lights in Nigeria: Sizing for the Rainy Season (Lagos, Abuja, Kano, Port Harcourt)
How to size solar street lights for Nigeria using satellite sun data for Lagos, Abuja, Kano and Port Harcourt: worst-month sun hours, panel and battery size for a 40 W light, rainy-season autonomy, and what to check in a quotation.
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How Many Rainy Days Can a Solar Street Light Last? Autonomy Explained
What 'days of autonomy' really means for a solar street light, why datasheet figures are often optimistic, how to check a light against your rainy season, and what to change when the battery is too small.
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Road Lighting Classes Explained: EN 13201 M, C and P Classes (with Lux Values)
What the EN 13201 road lighting classes mean, the luminance and illuminance each class requires, how to choose the class for a road, and what it means for street light wattage, pole height and spacing.
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Solar vs Grid Street Lights: Which Costs Less Over 10 Years?
A total-cost-of-ownership comparison of solar street lights and grid-powered LED street lights: trenching and cabling, grid connection, electricity, battery replacement and maintenance, with a worked 100-light example and the cases where each option wins.
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Lighting Market Brief, 19 October 2026: Delhi Starts 100,000 Smart LED Streetlights, Lithium Carbonate Falls Again, Aluminium Steady
This week: Delhi launches the replacement of about 100,000 streetlights with app-monitored smart LEDs under a seven-year performance contract, battery-grade lithium carbonate drops another 9% to about RMB 109,000/t with LFP cells following, and LME aluminium holds near US$3,030/t.
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HPS to LED Conversion: LED vs Sodium Street Lights, Wattage Chart and Payback
What LED wattage replaces a 70, 150, 250 or 400 W high-pressure sodium lamp? A conversion chart for street and area lighting, why ballast losses matter, how much energy you save, and how to calculate payback.
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How Many LED High Bay Lights Do I Need? A Warehouse Lighting Layout Guide
Work out how many LED high bay lights a warehouse, factory or sports hall needs: recommended lux levels, the lumen method step by step, spacing rules by beam angle, and a worked example for a 60 × 30 m warehouse.
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Lighting Market Brief, 12 October 2026: Cambodia Lights 1,200 km of Roads with Solar, LFP Cell Prices Slide, Aluminium Eases
This week: Cambodia starts a national solar street lighting programme on about 1,200 km of roads, LiFePO4 cell and lithium prices keep falling, LME aluminium eases from its summer high, a Rutgers study links LED street lighting to a 46% drop in violent crime, and copper theft pushes cities towards solar.
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Solar Street Light Pole Height and Spacing Guide
How high to mount solar street lights and how far apart to space them, by road type and width. Includes layout rules for single-side, staggered and opposite arrangements, typical wattage by pole height, and a worked example.
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LiFePO4 vs Gel vs Lithium-Ion (NMC) Batteries for Solar Street Lights
Which battery should a solar street light use? A comparison of LiFePO4, gel lead-acid and NMC lithium-ion on cycle life, usable capacity, heat and cold tolerance, safety, weight and lifetime cost.
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How to Calculate Solar Street Light Battery Capacity (with Worked Examples)
A step-by-step method to size the battery of a solar street light in Wh and Ah, from LED power, lighting schedule, nights of autonomy and depth of discharge, with three worked examples and the mistakes that make lights fail in the rainy season.
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All-in-One vs Split Solar Street Lights: Which Should You Buy?
An engineer's comparison of integrated (all-in-one) and split solar street lights covering battery capacity, panel size, installation cost, theft, maintenance and climate, with a decision table for your project.