How to choose solar lights

Updated October 2026

A solar light is a small system in one body: a panel, a battery and an LED. Most disappointing lights fail on one of three points: not bright enough for the job, a battery that is too small, or a panel that cannot refill it.

1. Brightness in lumens

Judge brightness by lumens, not by the watts printed on the box. Rough starting points: garden and path lights need little, street and flood lights need far more. Check that the lumens figure is the real output and not the peak of a short boost mode.

2. Battery size and nights of light

• Choose a battery that gives light for two or three nights after a cloudy day.
• LiFePO4 cells last longer than older types and handle heat better.
• Motion-dimming lights stretch the battery by running dim until someone passes.

3. Panel size and placement

• A bigger panel refills the battery faster on short winter days.
• The panel needs full sun for most of the day and no shade from walls or trees.
• Models with a separate panel can sit in the sun while the light sits in the shade.

Which type for which job

• Street lights: one body on a pole, long runtimes and dimming.
• Flood lights: security and yards, usually with a motion sensor.
• Garden and string lights: decorative, low brightness.
• Home kits: a panel with a few bulbs, good where there is no wiring.

Next step: see solar lights and other parts, or size a larger system with the calculator.