Solar Garden Lights Off the Grid: What to Check Before Specifying

Solar garden lighting can be useful where a suitable charging location is available and extending a mains cable is inconvenient. The right decision depends on daylight, required light level and operating time. A solar label alone cannot establish reliable all-night performance for a particular site.

Start with the task and the charging position

A garden marker and a route that must meet a defined night-time lighting requirement need different assessments. Decide how long the light must operate, which area it must illuminate and whether reduced output is acceptable. Then check where the panel will receive daylight through the relevant season.

Buildings, roof overhangs, trees and new planting can shade a panel. Seasonal weather also changes charging opportunities. Where a project requires a defined lighting level or operation through several poor-weather days, request a site-specific assessment and verified operating data before selecting the system.

Read the catalogue values in context

HR90061 is the compact head in the catalogue family, while HR90062 is shown with a garden spike. Their product pages list PC + ABS construction, a PC diffuser, IP65 and a solar supply with a 3.7 V, 2000 mAh battery. The shared catalogue specification provides additional reference values:

• Battery: 18650, 3.7 V, 2000 mAh. Nominal stored energy is about 7.4 Wh. Usable energy depends on battery condition and the control system.
• Solar panel: 1.7 W. This is a rated panel value, not a guarantee of the energy collected at the installation.
• LED source: SMD2835, maximum 7 W. Maximum source power is not the same as continuous night-time operating power.
• Light value: maximum 770 lm for the circuit board. This is a board-level catalogue figure, not a verified continuous delivered-lumen value for the assembled fitting.
• Discharge reference: five hours when operating at 1.5 W. The catalogue does not give the full test conditions. Confirm the current model, mode and charging conditions before using this as a project requirement.

The same catalogue lists a five-hour charging reference. It should not be interpreted as five hours to full charge under any sky or season. Obtain the charging conditions and current operating-mode information for the product being ordered.

Check energy as well as maximum power

The battery calculation is straightforward: 3.7 V × 2 Ah equals about 7.4 Wh of nominal energy. At a constant 7 W load, the ideal energy-only calculation would be about 1.1 hours before losses and reserve limits. This is not a measured runtime; it shows why maximum LED power cannot be combined with an assumed all-night duration.

Actual performance depends on the operating mode, charging, controller consumption, battery condition and temperature. Ask for the brightness schedule and the test conditions behind any runtime statement. A lower-power mode may run longer, but its useful illumination must still match the task.

Keep protection, controls and service life separate

IP65 concerns enclosure ingress protection. It does not establish battery cycle life, immersion suitability or an ambient-temperature range. The available product pages also do not confirm app connectivity, remote monitoring or a particular motion-control schedule for this solar family. Specify only the functions confirmed for the current version.

Before ordering, provide the location, expected winter conditions, mounting arrangement, required light period and intended quantity. Request the current technical sheet, charging and discharge test conditions, available modes and battery-service instructions. A sample trial at the actual site can then answer the practical question: does this configuration provide the light needed, for the time needed?

References: HORLITE catalogue pages 11–12 and linked product pages, checked 14 October 2026. The energy calculation is illustrative and is not a runtime warranty. Catalogue source values should be confirmed for the final supplied configuration.