IllumiGauge: Lux Light Meter

See your light. Know your space. IllumiGauge helps you understand the light around you, from your reading corner to your next photograph or indoor plant. Get live light estimates, explore changes over time and keep the readings that matter. MEASURE YOUR LIGHT View lux, foot-candles and exposure value at ISO 100 on a clear instrument dial. Follow the live chart, check session minimum, maximum and average, and hold a reading when you need a closer look. Adjust smoothing and calibrate against a reference meter. PLAN YOUR EXPOSURE Calculate shutter speed, aperture or ISO from a live or manually entered light value. Work in full, half or third stops, account for exposure compensation and ND filters, and calculate video shutter settings using frame rate and shutter angle. UNDERSTAND PLANT LIGHT Estimate photosynthetic photon flux density (PPFD) and daily light integral (DLI) using the light-source type and hours of light. Compare indicative plant-light ranges to help you understand your growing space. SAVE, COMPARE AND EXPORT Save readings and session samples with notes and named locations. Browse history, compare location trends and export a single reading or your saved records as CSV using the system share sheet. Location names are labels you enter; GPS access is not required. FIND YOUR REFERENCE Explore typical lighting ranges for homes, workspaces, outdoor conditions and plants. Set a target and see whether your current light falls below, within or above the range. DESIGNED FOR iPHONE AND iPAD Enjoy responsive tablet layouts, native iOS controls, light and dark appearances, and Liquid Glass navigation on supported iOS versions. No account is needed. Measurements, saved records and calculations work offline; the update service uses a connection when available. ABOUT ACCURACY On iPhone and iPad, IllumiGauge estimates illuminance from the selected front or rear camera’s exposure. It does not record photos or upload camera frames. Camera permission is required for live metering; manual exposure calculations, history and the guide remain available without it. Readings and plant-light conversions are indicative, vary by device and light source, and are not a substitute for a calibrated meter or certified lighting assessment. Calibration against a reference instrument can improve agreement. PRIVACY Your readings, notes and named locations stay on your device unless you choose to export them. There are no ads, accounts or cross-app tracking. The update service receives an anonymous installation identifier and technical information to deliver updates and count active installations. Read the full policy at https://illumigauge.eaprism.com/privacy/. Support: https://illumigauge.eaprism.com/support/