Overview
LIT DUO 1 is a modern all-in-one light meter for filmmakers, photographers, video creators, lighting designers, and other professionals who need fast, reliable, and intuitive control of light. It combines the essential tools for exposure, flash, colour temperature, spectrum, illuminance, and flicker measurement in one compact handheld device.
Included in box
LIT DUO 1
Protective case
Neck strap
Quick Start and Safety Guide
About the Lit Systems AB LIT DUO 1 Digital Light Meter
LIT DUO 1 is a modern all-in-one light meter for filmmakers, photographers, video creators, lighting designers, and other professionals who need fast, reliable, and intuitive control of light. It combines the essential tools for exposure, flash, colour temperature, spectrum, illuminance, and flicker measurement in one compact handheld device.
Say hello to the future of light metering.
All-in-one light metering for modern creators.
Fast, intuitive, and built for real production work.
One device. Essential light metering tools.
Modern light metering, finally made simple.
LIT DUO 1 is designed to replace slower, more fragmented metering workflows with one compact and easy-to-use device. It brings together the core tools modern creators need for exposure, flash, colour, illuminance, spectrum, and flicker analysis, while keeping operation fast, practical, and easy to learn.
Built for real-world production use, LIT DUO 1 combines tactile controls, a compact form factor, durable construction, modern connectivity, and an actively evolving software.
It is made for users who want professional capability without complicated operation.
Who is it for
LIT DUO 1 is designed, built, and optimised for:
Filmmakers
Cinematographers
Gaffers and lighting technicians
Photographers
Video creators
Broadcast professionals
Stage and event lighting professionals
Rental houses, film schools, and production teams
LIT DUO 1 is designed around the needs of modern creators who work across film, video, photography, and lighting. Instead of forcing users to carry separate meters or work through slow and complicated interfaces, it brings the key measuring functions together in one compact device built for speed, clarity, and everyday use.
It is also designed as a platform that continues to improve through firmware updates, giving users more flexibility and value over time.
Main Benefits
Control exposure and colours more confidently
Build looks, compare, and repeat setups more easily.
Work faster
Reduce trial and error and move more quickly through prep, setup, shooting, and troubleshooting. Spend less time in post-production.
Carry less gear
Handle multiple essential measuring tasks with one compact device.
Get more consistency
Improve repeatability across scenes, setups, fixtures, and locations.
Grow into more advanced workflows
Suitable both for experienced professionals as well for creators who want professional tools without a steep learning curve.
Main measuring Functions
Exposure and Flash
Designed for ambient and flash exposure workflows in both motion and still-image production. Useful for setting correct camera exposure, checking light ratios, and keeping setups consistent.
Colour Temperature
Useful for measuring and matching light sources, balancing mixed lighting, and making white-balance decisions with more confidence.
Spectrum and Colour
Useful for evaluating light quality, comparing fixtures, shaping mood and feel, and recreating looks more consistently.
Illuminance
Useful for measuring light levels in technical, production, stage, studio, and architectural workflows.
Flicker Analysis
Useful for identifying problematic light sources, analyzing flicker behavior, and reducing the risk of rolling artifacts or poor footage.
Typical use cases
Controlling exposure and scene contrast
Matching lighting between setups
Checking light ratios without relying only on the camera
Measuring and/or matching mixed light sources and practicals
Balancing whites and improving colour consistency
Evaluating fixture quality and spectral behavior
Checking for flicker issues before shooting
Building repeatable lighting setups for film, video, stage, and photography
LIT OS and LIT App
The firmware running on LIT DUO 1 is called “LIT OS”.
LIT DUO 1 supports LIT OS updates via the LIT smartphone apps or via USB-C using a computer and the dedicated firmware file. This helps keep the device current and allows the product to keep improving over time.
LIT OS: What is coming next
Some of the planned new LIT OS features (LIT OS 0.9 & 1.0, paired with app updates):
Full remote control via LIT apps
Ability to store and organise measurements
Aperture-priority in Exposure modes
Displaying more units in Exposure modes
A redesigned Spectrum mode with more configurability and more precise graph
Spectral accuracy improvements
New Spectral unit options: CRI, SSI
New tint-unit options
Colour-difference mode
Exposure-difference mode
Camera-target mode
LIT OS 0.9 is estimated to be released around June 2026.
LIT OS 1.0 is estimated to be released around September 2026.
LIT App: Compatibility
Apple devices
Compatibility:
Mac: Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
iPhone, iPad: Requires iOS 14.0 or later.
Android devices
Compatibility: Requires Android 8.0 and up
LIT App: What is coming next
Currently, LIT App can upgrade and downgrade the LIT OS on LIT DUO 1 via Bluetooth. Some of the planned new LIT App features (to be released in parallel to LIT OS 0.9 & 1.0):
Full remote control via LIT apps
Ability to store and organise measurements