Photocell Settings and Calibration
Video Tutorial: Watch the companion video V49: Photocell Settings and Calibration for a visual walkthrough.
Overview
Photocell sensors turn lights on and off based on ambient light levels, providing dusk-to-dawn operation. Proper threshold configuration ensures reliable operation without unwanted cycling.
Understanding Thresholds
ON Threshold
The light level below which the fixture turns on. - Typically set for dusk conditions - Default: 10 fc (100 lux)
OFF Threshold
The light level above which the fixture turns off. - Typically set for dawn conditions - Default: 60 fc (600 lux)
The Gap
The difference between ON and OFF thresholds: - Prevents rapid cycling during variable conditions - Minimum recommended: 15 fc (150 lux) - Larger gaps provide more stability
Default Settings
| Parameter | Default Value |
|---|---|
| ON threshold | 10 fc (100 lux) |
| OFF threshold | 60 fc (600 lux) |
Auto-Calibration
Auto-calibration calculates the OFF threshold automatically based on your ON threshold.
Using Presets
- Access photocell settings for the fixture.
- Select a preset ON threshold: 5 fc, 50 fc, or 100 fc.
- Lights cycle on and off to calculate OFF threshold.
- Wait for calibration to complete.
- Success message or rapid flash indicates result.
Using Custom Values
- Enter a custom ON threshold value.
- Tap Cal to calculate OFF threshold.
- Wait for calibration to complete.
Manual Setting
If auto-calibration fails or you prefer direct control:
- Enter desired ON threshold.
- Enter desired OFF threshold (at least 15 fc higher).
- Tap Send to apply.
Threshold Recommendations
| Application | ON Threshold | OFF Threshold |
|---|---|---|
| Security lighting | 5-10 fc | 50-60 fc |
| Parking lots | 10-20 fc | 60-80 fc |
| Walkways | 10-15 fc | 60-75 fc |
| Building facades | 5-10 fc | 50-60 fc |
| General outdoor | 10 fc | 60 fc |
Calibration Failures
Indication
Lights flash rapidly several times.
Common Causes
| Cause | Solution |
|---|---|
| Sensor tilted | Reposition to face sky/ambient |
| Daylight too bright | Calibrate indoors or at twilight |
| Variable conditions | Wait for stable lighting |
| Sensor reading fixture light | Increase OFF threshold |
| Sensor blocked | Clear obstructions |
If Calibration Continues to Fail
- Use manual threshold setting
- Try calibrating at a different time
- Check sensor installation and positioning
Installation Considerations
| Scenario | Adjustment |
|---|---|
| Sensor faces reflective wall | Higher OFF threshold |
| Direct sunlight on sensor | Reposition or shield |
| Heavy tree cover | Lower ON threshold |
| Street lighting nearby | Consider interference |
Troubleshooting
| Issue | Cause | Solution |
|---|---|---|
| Lights won't turn on at dusk | ON threshold too low | Increase ON threshold |
| Lights won't turn off at dawn | OFF threshold too high | Decrease OFF threshold |
| Lights cycling on/off | Gap too small | Increase gap between thresholds |
| Calibration fails repeatedly | Environmental factors | Use manual setting |
Quick Reference
| Action | Steps |
|---|---|
| Auto-calibrate (preset) | Select 5fc/50fc/100fc button |
| Auto-calibrate (custom) | Enter ON value → Tap Cal |
| Manual set | Enter ON → Enter OFF → Tap Send |
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Based on Keilton+autani App User Guide v9.7