Astronomic Timer vs. Photocell for Landscape Lighting
An astronomic timer calculates switching times from calendar and location settings. A photocell responds to the light it senses. A fixed timer follows the times you program. The best choice depends on whether you want seasonal adjustment, response to local darkness, or a simple fixed schedule.
Choose the behavior you need
- Astronomic: useful for a sunset-related schedule that changes through the year. Correct date and location settings matter.
- Photocell: responds to ambient light. Placement and nearby artificial light can affect operation.
- Fixed timer: suits a specific schedule, but may need seasonal changes.
Set an appropriate off time
Lights do not have to run until dawn merely because they turn on at dusk. Choose the operating period for actual use and any project requirements. A shorter schedule can reduce energy use when the lighting is unnecessary.
Check compatibility and features
Confirm the control's voltage, load rating, installation environment, and fit with the transformer. Astronomic scheduling does not automatically include Wi-Fi, independent zones, or dimming. Those require separately specified capabilities.
Commission and record
Set the date, time, location, and daylight-saving options as required. Test manual operation, return the device to its automatic mode, and check the next scheduled event. Save a photograph of the settings.
If lights operate at the wrong time, inspect settings and overrides before replacing the transformer. For a photocell, consider nearby lighting and obstruction. Follow the device's testing procedure instead of permanently bypassing it.
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- Kevin Simon