Light Meter: Exposure & Lux

Light Meter turns your phone into an exposure meter for film photography (35mm, medium and large format analog cameras), and a lux meter for plants and grow lights.

Set your film's ISO, choose the aperture or the shutter speed, and the meter suggests the other one, rounded to the marks on your camera's dials. Tap Hold to keep the reading while you set your camera.

FREE

• Reflected light meter using the camera's own metering

• Aperture or shutter priority: tap a side to set it, read the other

• Full and half stops, film speeds from ISO 6 to 12800

• EV readout with a needle scale, and a Hold button

• Clear warnings when a setting is off the dial: too bright for 1/8000, or longer than 30 seconds (bulb)

• Calibration: match a meter or camera you trust, or use the Sunny 16 check

• Lux meter for plants: use your phone's light sensor, or point the camera at a sheet of white paper; foot-candles too

LIGHT METER PRO

• Spot metering: tap any point in the viewfinder to meter it

• Third-stop apertures and shutter speeds

• Camera presets with your lens and shutter range, so the meter only suggests what your camera can set

• 35 film presets, with reciprocity times for films whose makers publish a formula

• ND and color filters, and exposure compensation

• Notes: save each reading with the frame number and share the list

• Grow light PPFD (the PAR photon flux) and daily light integral (DLI) for sunlight, LEDs, fluorescent, HPS and metal halide

HONEST NUMBERS

Light Meter reads the exposure your phone's camera chooses for the scene. It is a practical guide, not a lab instrument: phones differ a little, so calibrate it once against a meter you trust. Lux, PPFD and DLI are estimates.

PRIVATE

The camera picture is shown on screen only. No photo or video is taken, saved or sent. No account, no ads.

Light Meter Pro is available as a yearly subscription with a free trial, or as a one-time lifetime purchase. Subscriptions renew automatically until cancelled; manage or cancel them in Google Play, Payments and subscriptions.

Privacy Policy: https://itworkedsystems.com/light-meter/privacy