Light Meter LM-3000

Turn your smartphone into a professional-grade light meter. Measure illuminance (lux/foot-candle) and color temperature (CCT in Kelvin) with unmatched accuracy — trusted by photographers, engineers, and lighting professionals worldwide.

Why waste money on a hardware meter when you’re already carrying one in your pocket?

The LM-3000 offers the same quality and usability as a traditional hardware light meter.
Developed by optics scientists at the Zurich University of Applied Sciences, LM-3000 is the only light meter app scientifically validated for accuracy. It achieves professional-grade precision by leveraging your iPhone's front-facing camera sensor with advanced RAW image processing. Unlike relying on estimates like other apps, it adheres to the ISO/CIE 19476 standard, ensuring measurements you can trust for critical applications.

MEASUREMENTS

⎷ Illuminance in lux or foot-candles
⎷ Correlated color temperature in kelvin

FEATURES

⎷ Industry-leading accuracy, matching professional high-end lux meters
⎷ Pre-calibrated for your specific device
⎷ Excellent low light sensitivity to detect light pollution
⎷ No ads
⎷ No Bluetooth and location permission required
⎷ In-app manual
⎷ Save peak reading
⎷ HOLD function with acoustic signal
⎷ Custom calibration option to align readings to another meter

DIFFUSER REQUIRED

Like every real light meter, the LM-3000 requires a diffuser to measure accurately. A diffuser scatters incoming light evenly on the sensor and prevents hotspots. While it may sound complex, the solution is surprisingly easy. You have two options:

1) Easily build a diffuser yourself in less than a minute using standard printer paper. This is accurate enough for most use cases.

2) Get the dedicated Diffuser Accessory (free worldwide shipping) for best accuracy and convenience. More details on https://lightray.io/diffuser/

(!) Avoid apps that don’t require a diffuser! They are inaccurate because they ignore the basic physics of light measurement.

TRY BEFORE YOU BUY

The LM-3000 is free to download and comes with a free trial period. The trial period lasts for two non-consecutive days, giving you enough time to see if the app fits your needs. The status of your free trial will be shown as the "battery level" on the top right of the LM-3000's display and on the "Battery Status" screen.

Once your light meter's "battery" is depleted, you may choose a Charging Option to keep using the app. You can pick what works best for you:
→ Single Charge — top-up for another 48 hours (perfect for occasional use),
→ Continuous Charging — a monthly subscription (great if you use it regularly),
→ Unlimited Battery — a one-time purchase for unlimited lifetime access

LM-3000 is the result of over five years of dedicated research and development, ensuring you get a tool that is precise and reliable. Every in-app purchase supports future development and helps keep the app ad-free for everyone.
As a member of 1% for the Planet, we donate at least one perce