❓ Frequently Asked Questions

Lux Meter Pro is a professional light measurement application designed for electricians, lighting consultants, facility managers, and other professionals who need accurate illuminance measurements for compliance, safety, and quality assurance.

Key Features:

• Professional lux measurements using iPhone sensors
• Emergency lighting testing (BS 5266-1 compliant)
• Certificate generation for professional documentation
• Room grid mapping for comprehensive lighting analysis
• Cloud synchronization and team collaboration

Lux Meter Pro is currently available for iOS devices through the App Store, with Android support coming soon.

Installation Steps:

1. Open the App Store on your iPhone or iPad
2. Search for "Lux Meter Pro"
3. Tap "Get" to download and install
4. Open the app and create your professional account
5. Important: Go to Settings first to configure your business details

System Requirements:

• iOS 14.0 or later
• iPhone 6s or newer for optimal accuracy
• Internet connection for cloud features
• Camera access for emergency testing photos

Basic lux measurements can be taken without an account, but professional features require registration and subscription.

Free Features (No Account):

• Basic lux measurements
• Limited measurement history
• Basic PDF export

Professional Features (Account Required):

• Unlimited measurements and storage
• Professional certificate generation
• Emergency lighting testing tools
• Room grid mapping
• Cloud synchronization
• Team collaboration
• Digital signature integration

Yes, Lux Meter Pro provides professional-grade accuracy suitable for compliance testing, safety assessments, and professional documentation when used correctly.

Accuracy Specifications:

• Typical Accuracy: ±10-15% under standard conditions
• Range: 0.1 to 20,000+ lux
• Calibration: Device-specific calibration coefficients
• Comparison: Regularly validated against professional instruments

Professional Use Guidelines:

1. Follow proper measurement techniques
2. Understand sensor limitations and environmental factors
3. Use multiple measurements for critical assessments
4. Consider professional instrument verification for compliance-critical work

Lux Meter Pro is designed to support compliance with major lighting and electrical safety standards used by professionals worldwide.

Supported Standards:

• BS 5266-1:2016 - Emergency lighting code of practice
• BS EN 12464-1 - Lighting of work places
• CIBSE Guidelines - Lighting design standards
• IES Standards - Illumination engineering practices
• NICEIC Requirements - Approved contractor documentation

Certificate Templates Include:

• Emergency Lighting Periodic Test Certificates
• Emergency Lighting Logbooks
• Fire Alarm Commissioning Certificates
• Minor Electrical Works Certificates
• Professional measurement reports

Lux Meter Pro includes comprehensive emergency lighting testing tools designed for BS 5266-1 compliance.

Emergency Testing Features:

• Monthly function tests with timing
• Annual full-duration tests (1-3 hours)
• Automated test timers and rest periods
• Lux level measurements at critical points
• Photo documentation of each luminaire
• Compliance reporting and certificates

Step-by-Step Process:

1. Navigate to Emergency Testing in the app
2. Select test type (function or full duration)
3. Follow on-screen guidance for each luminaire
4. Take lux measurements at floor level
5. Document any defects or issues
6. Generate compliance certificates

For detailed guidance, see our Complete EM Testing Guide.

Yes! Digital signature integration is a key professional feature that streamlines certification workflows.

Digital Signature Setup:

1. Go to Settings > Business Information
2. Upload your signature image (PNG/JPG)
3. Verify signature appears correctly in preview
4. All future certificates will include your signature automatically

Signature Requirements:

• Clear, high-contrast signature image
• White or transparent background preferred
• Maximum file size: 2MB
• Recommended format: PNG for transparency

Professional Benefits:

• Automatic inclusion on all certificates
• Consistent professional branding
• Saves time on every project
• Meets NICEIC documentation requirements

Lux Meter Pro uses your iPhone's ambient light sensor combined with advanced algorithms to provide professional-grade illuminance measurements.

Technical Process:

1. Sensor Reading: iPhone ambient light sensor detects light intensity
2. Calibration: Device-specific calibration coefficients applied
3. Algorithm Processing: Advanced calculations convert sensor data to lux values
4. Environmental Correction: Adjustments for temperature and conditions
5. Output: Accurate lux measurement displayed

Sensor Limitations:

• Sensitivity to device orientation
• Temperature effects on accuracy
• Spectral response differences from professional meters
• Limited range compared to dedicated instruments

Accuracy Optimization:

• Keep device flat and steady during measurement
• Allow sensor to stabilize (2-3 seconds)
• Avoid shadows or reflections on sensor
• Take multiple readings for critical measurements

Lux Meter Pro supports all modern iPhone and iPad models, with optimal performance on newer devices.

Fully Supported Devices:

• iPhone 14 Series: Optimal accuracy and performance
• iPhone 13 Series: Excellent accuracy and features
• iPhone 12 Series: Full feature support
• iPhone 11 Series: Good accuracy, all features
• iPhone XS/XR Series: Good performance
• iPhone X/8 Series: Basic support

iPad Support:

• iPad Pro (all generations)
• iPad Air (3rd generation and later)
• iPad (6th generation and later)
• iPad Mini (5th generation and later)

Minimum Requirements:

• iOS 14.0 or later
• Ambient light sensor
• 50MB available storage
• Internet connection for cloud features

Lux Meter Pro includes automatic calibration updates, but understanding calibration helps ensure optimal accuracy.

Automatic Calibration:

• Device-specific calibration coefficients updated automatically
• Algorithm improvements pushed via app updates
• No manual calibration required for normal use
• Background optimization based on usage patterns

Professional Verification:

• Monthly: Compare readings with known good instrument
• Before Critical Work: Verify accuracy against reference
• After Major iOS Updates: Check readings remain consistent
• Environmental Changes: Verify performance in different conditions

Calibration Verification Process:

1. Use a calibrated reference light meter
2. Take measurements in identical conditions
3. Compare readings at multiple light levels
4. Document any significant deviations
5. Contact support if readings differ by >20%

You can find your device serial number and calibration information in Settings > Device Information.

Understanding factors that affect accuracy helps ensure reliable professional measurements.

Environmental Factors:

• Temperature: Extreme temperatures can affect sensor sensitivity
• Humidity: High humidity may cause condensation on sensor
• Ambient Conditions: Bright sunlight can saturate readings
• Electrical Interference: Strong EMF fields may affect sensors

Device Factors:

• Screen Protectors: May filter light reaching sensor
• Cases: Some cases may obstruct the sensor
• Dirt/Debris: Clean sensor area regularly
• Battery Level: Very low battery may affect performance

Measurement Technique:

• Device Position: Keep flat and steady
• Shadows: Avoid blocking light to sensor
• Stabilization Time: Allow 2-3 seconds for stable reading
• Multiple Readings: Take several measurements and average

Light Source Factors:

• Spectral Distribution: LED vs fluorescent vs incandescent
• Flicker: Some LED sources may cause reading variation
• Color Temperature: Very warm or cool sources
• Uniformity: Uneven lighting may require multiple measurements

Lux Meter Pro offers flexible subscription plans designed for different professional needs, from individual professionals to large organizations.

Available Plans:

• Free Tier: Basic measurements with limited features
• Professional: Full features for individual professionals
• Business: Team management and advanced reporting
• Enterprise: Custom features and white-label options

Professional Plan Features:

• Unlimited lux measurements
• Emergency lighting testing tools
• Professional certificate generation
• Room grid mapping
• Cloud synchronization
• PDF report generation
• Digital signature integration
• Priority email support

Business Plan Additional Features:

• Team management (up to 10 users)
• Advanced reporting and analytics
• Project collaboration tools
• Priority phone support
• Custom branding options
• API access

For current pricing and detailed feature comparisons, visit our pricing page.

Yes! Our no-contract policy means you can cancel your subscription at any time, for any reason, with no penalties or fees.

Cancellation Benefits:

• No Minimum Term: Cancel after any billing period
• No Cancellation Fees: No charges for ending subscription
• No Exit Penalties: No financial penalties
• Immediate Processing: Cancellation processed within 24 hours
• Service Until Period End: Continue using until current period expires

How to Cancel:

1. In-App: Go to Settings > Subscription > Cancel
2. App Store: Manage subscription in iOS settings
3. Email: Send request to support@luxmeterpro.com
4. Phone: Call support during business hours

After Cancellation:

• Data remains accessible for 90 days (read-only)
• Export all data as PDFs during grace period
• Reactivate anytime within 90 days with full data restoration
• Immediate deletion available upon request

We accept multiple payment methods to accommodate different professional and business needs.

Individual/Professional Plans:

• Apple App Store: All major credit/debit cards
• Apple Pay: Quick and secure payment
• App Store Gift Cards: iTunes/App Store credit
• Family Sharing: Shared payment methods

Business/Enterprise Plans:

• Direct Billing: Credit/debit cards
• Invoice Billing: Net 30 terms for qualified accounts
• Bank Transfer: Direct bank payments
• Purchase Orders: Accepted for enterprise accounts

Billing Cycles:

• Monthly: Billed every 30 days
• Annual: Billed yearly with significant savings
• Custom: Quarterly/semi-annual for enterprise

Currency Support:

• GBP (British Pounds) - Primary
• USD (US Dollars)
• EUR (Euros)
• Other major currencies via App Store

Yes, we offer fair and flexible refund policies that vary by purchase method and circumstances.

App Store Purchases:

• Refunds handled according to Apple's App Store policy
• Request refunds through Apple directly
• Typically approved for technical issues or accidental purchases
• Decision made by Apple based on their criteria

Direct Billing Refunds:

• 14-Day Trial: Full refund within 14 days of initial subscription
• Annual Plans: Pro-rated refund if cancelled within 30 days
• Technical Issues: Full refund if we can't resolve service problems
• Billing Errors: Immediate correction and refund

Refund Process:

1. Contact support@luxmeterpro.com with refund request
2. Provide reason and relevant details
3. We'll review and respond within 48 hours
4. Approved refunds processed within 5-7 business days

Non-Refundable Situations:

• Partial month subscriptions (for direct billing)
• Services already fully utilized
• Violation of terms of service
• Requests beyond refund timeframes

Zero readings or measurement failures are usually caused by sensor access issues or environmental factors.

Quick Fixes to Try:

1. Restart the App: Close completely and reopen
2. Check Permissions: Ensure camera/sensor access is enabled
3. Clean Sensor Area: Wipe the top of your iPhone near the camera
4. Remove Case/Screen Protector: Temporarily test without accessories
5. Restart Device: Power cycle your iPhone

Check These Settings:

• Settings > Privacy > Camera > Lux Meter Pro (should be ON)
• Settings > Screen Time > Content Restrictions (check not blocking)
• Settings > General > Restrictions (if enabled, check camera access)

Environmental Checks:

• Adequate Light: Sensor needs some ambient light to function
• No Obstructions: Don't cover the sensor with fingers
• Stable Position: Hold device steady for 2-3 seconds
• Temperature: Avoid extreme hot/cold conditions

If Still Not Working:

1. Test with iPhone's built-in flashlight (to verify sensor works)
2. Try in different lighting conditions
3. Update to latest iOS version
4. Delete and reinstall the app
5. Contact support with device model and iOS version

Measurement accuracy depends on proper technique and understanding sensor limitations.

Improve Measurement Technique:

• Device Position: Hold flat and parallel to measurement surface
• Stabilization: Wait 2-3 seconds for reading to stabilize
• Multiple Readings: Take 3-5 measurements and average
• Consistent Position: Maintain same distance and angle
• Avoid Shadows: Don't block light with your body/device

Environmental Factors:

• Flicker: Some LED lights cause reading variation
• Color Temperature: Very warm/cool sources may affect accuracy
• Reflections: Avoid measuring reflected light accidentally
• Temperature: Let device acclimate to room temperature

Calibration Verification:

1. Compare with a known calibrated meter
2. Test in multiple lighting conditions
3. Check readings are within expected range (±15%)
4. Note any consistent offset patterns
5. Document conditions where accuracy seems poor

When to Contact Support:

• Readings consistently off by >25%
• Sudden change in measurement accuracy
• Readings don't respond to light changes
• Accuracy varies significantly between measurements

App crashes or freezes can be caused by various factors including device memory, iOS version compatibility, or app-specific issues.

Immediate Solutions:

1. Force Close App: Double-tap home button and swipe up on Lux Meter Pro
2. Restart iPhone: Hold power + volume down buttons until restart
3. Free Up Storage: Ensure at least 1GB free space available
4. Close Other Apps: Free up RAM by closing unused applications
5. Check iOS Version: Update to latest iOS if available

Advanced Troubleshooting:

• Update App: Check App Store for Lux Meter Pro updates
• Reset Network Settings: Settings > General > Reset > Reset Network Settings
• Delete and Reinstall: Remove app completely and reinstall from App Store
• Restore from Backup: If problem persists after reinstall

Device-Specific Issues:

• Older Devices: iPhone 7/8 may struggle with complex operations
• Low Battery: Performance throttling can cause crashes
• Overheating: Device thermal management may limit performance
• Background App Refresh: Disable if experiencing memory issues

When to Contact Support:

• Crashes occur consistently during specific actions
• Problem persists after reinstalling app
• Other apps work fine but Lux Meter Pro doesn't
• Crashes started after specific iOS or app update

Cloud sync issues can prevent access to your measurements across devices and backup functionality.

Check Connection Status:

1. Internet Connection: Verify WiFi or cellular data is working
2. Account Status: Ensure you're logged into your Lux Meter Pro account
3. Subscription Status: Cloud sync requires active Professional subscription
4. App Permissions: Check network access permissions are enabled

Troubleshooting Steps:

• Manual Sync: Go to Settings > Data > Sync Now
• Sign Out/In: Refresh account connection
• Check Server Status: Temporary outages may affect sync
• Clear Cache: Settings > Storage > Clear Cache

Common Sync Issues:

• Large Files: Room grids with many measurements may sync slowly
• Poor Connection: Switch to stable WiFi for initial sync
• Storage Limits: Professional plan includes 10GB cloud storage
• Multiple Devices: Sync may take time to propagate between devices

Data Recovery Options:

• Local Backup: Export data as PDF while troubleshooting
• Device Transfer: Use iTunes/Finder backup for device changes
• Support Recovery: Contact support for data recovery assistance

PDF generation issues can prevent you from creating professional reports and certificates for your work.

Common PDF Issues:

• Incomplete Data: Ensure all required fields are filled
• Large Files: Reports with many images may take time to generate
• Storage Space: Insufficient device storage prevents PDF creation
• Network Issues: Cloud-based templates require internet connection

Troubleshooting Steps:

1. Check Required Fields: Complete all mandatory information
2. Free Up Space: Ensure 500MB+ available storage
3. Try Smaller Reports: Generate individual certificates vs bulk exports
4. Use WiFi: Stable connection for cloud processing
5. Wait for Processing: Complex reports may take 30+ seconds

Certificate-Specific Issues:

• Missing Signature: Upload digital signature in Settings first
• Business Info: Complete business details for professional certificates
• Template Errors: Try different certificate template
• Date Formats: Ensure dates are in correct format

Alternative Solutions:

• Share Instead: Use share function if download fails
• Email PDF: Send directly to email for backup
• Cloud Save: Save to iCloud/Dropbox instead of local storage
• Retry Later: Server processing issues may be temporary