Light Meter: Lumen Prism Gauge

Ever wondered if your desk is bright enough for long work sessions, whether your plants get the light they need, or how a room measures up for photography? Light Meter: Lumen Prism Gauge turns your phone's built-in ambient light sensor into a straightforward instrument that reads the room in lux. It classifies what it sees into clear brightness bands, lets you freeze and log readings, and keeps a searchable history so you can compare spaces over time. It's built for photographers, growers, home and office workers, and anyone simply curious about the light around them.

Luxo (the app's friendly name) focuses on a clean, distraction-free measuring experience. A live meter shows your current reading, a Hold function locks a value so you can note it without your hand moving the number, and a guided onboarding quiz tailors the app to why you're measuring in the first place. Material 3 design, calibration controls, and offline-only operation keep the tool honest and personal.

KEY FEATURES
• Live Light Meter - Reads your device's hardware light sensor in real time and displays the current lux level so you always know how bright a space actually is.
• Brightness Classification - Sorts each reading into clear categories like Bright, Moderate, and Average, giving instant context instead of just a raw number.
• Hold Reading - Freezes the active value with a single tap, so you can record or read it steadily without sensor jitter throwing off the result.
• Log Light Snapshots - Save any reading as a snapshot with an optional description, building a personal record of the environments you measure.
• Logged History - Browse all your saved snapshots in one place, revisit details, and compare how different rooms and times stack up.
• Snapshot Notes - Add and edit descriptions on each log entry so your readings stay meaningful, like "Office desk" or "Bedroom night light."
• Statistics - Computes average and summary stats across your samples, and lets you reset them when you want a fresh start.
• Sensor Calibration - Adjust a calibration multiplier scale to fine-tune readings, with the option to reset the instrument guides back to defaults.
• Foot-candle Display - Switch measurements to foot-candles alongside lux to match the unit your work already uses.
• Reference Bands - Calibrated reference bands help you interpret readings against practical lighting levels.
• Export & Share - Export your logged snapshots to CSV or share an individual light snapshot straight from the app.
• Theming Options - Choose display styles including AMOLED Pitch Black and Dark Slate Gray to suit your device and preference.
• Guided Onboarding - A short quiz and replayable guide set up your default instrument configuration based on your goals.

PERFECT FOR
• Photographers and videographers scouting light and dialing in settings.
• Plant owners verifying leaf-level growth light for healthy greenery.
• Home and office workers evaluating ergonomic light levels at a desk or workspace.
• The simply curious testing ambient light around kitchens, bedrooms, and study spaces.

HOW IT WORKS

Open the meter and point your device at the area you want to measure.

Tap Hold to freeze the reading, then log it as a snapshot with a note.

Review your Logged History, check the average stats, and export or share results.

PRIVACY
Luxo works completely offline with no account and no network calls. Your snapshots, notes, and settings stay on your device, and you can purge all logged data at any time. If your phone lacks a light sensor, the app clearly tells you rather than showing false numbers.

Measure smarter, not by guesswork. Download Light Meter: Lumen Prism Gauge and start reading the room, in lux.