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Four series: what changes between them

All four ranges are all-in-one solar street lights except LFT, which separates the panel from the lamp head. ASSL3 is the value range: Bridgelux 45mil chips at 130-150 lm/W, a mono panel from 65W to 130W and a 12V lithium battery from 28Ah to 96Ah, in a die-cast housing. ASSLB is the second generation at 200 lm/W on SMD3030 chips with an MPPT controller, which is worth the difference on sites where the panel area is limited by the pole.

ASSLA is the 80W and 150W platform built on SMD5050 chips and a LiFePO4 battery — the 150W unit carries a 36V/300W panel and a 25.6V/75Ah (1,920Wh) battery, which is the largest system in the range and the one specified for highways and industrial roads. LFT is a split system: the panel is mounted separately at the best angle and the lamp head sits on the arm, which is what an existing pole with a fixed tilt or a shaded position needs.

Power, output, panel and battery figures are the published datasheet values for each model. A solar system is sized to the installation latitude and the required autonomy, so the panel and battery in the table are the factory standard, not a guarantee for every site.

Panel and battery: the part that decides whether the light stays on

A solar street light is a system, and the wattage on the label is the smallest part of it. The panel has to replace in one day what the lamp consumes in one night plus the losses, and the battery has to carry the site through consecutive cloudy days. That is why the 120W ASSL3 ships with a 130W panel and a 96Ah battery while the 30W unit ships with 65W and 28Ah — the ratio is set by the load, not by the price list.

Three site inputs change the specification: the average daily sun hours at the latitude, the number of consecutive overcast days the client wants covered, and the nightly burn profile (full output all night, or dimmed after midnight). Send those three numbers with the pole height and we return the panel and battery for the site rather than the catalogue default.

Pole height is a recommendation for a type II distribution; the final height follows the road width and the spacing in the client brief.

Pole height, spacing and where a solar light stops making sense

Solar street lights win where there is no grid connection, where trenching costs more than the fixtures, or where a cable would be stolen. They lose where the pole is shaded for most of the day, where the road needs 20 lux or more over a wide carriageway, or where a long overcast season cuts the panel area below what the pole can carry.

A practical rule from our projects: 30-60W for lanes and paths at 4-6 m, 80-120W for collector roads at 6-10 m, and 150W only with the 300W panel and a clear south-facing position. Above that, an AC street light on grid power or a split system with a ground-mounted panel array is the more reliable design, and we will say so rather than sell a bigger battery.

Housing, protection and warranty

The lamp head is die-cast aluminium with a tempered or PMMA lens; the battery sits in a sealed compartment inside the head on the all-in-one models, which keeps the cable run to zero but makes the head heavier and the pole specification matter. LiFePO4 is used on the ASSLA and LFT ranges for cycle life and for cold-weather behaviour; the ASSL3 and ASSLB ranges use lithium cells sized to the daily load.

Every unit is tested as a system before packing — panel, controller, battery and lamp together — because a solar light that fails on site is almost always a mismatch between those four parts rather than a failed LED.

For grid-powered street and area lighting see the shoebox range and the all-in-one solar category.

Frequently asked questions

Related ranges: LED shoebox lights for grid-powered car parks and roadways, all-in-one solar street lights and semi-integrated solar lights for other system layouts, flood lights for yards and entrances.