Light Meters, Luxi, Cinemeter II: How Accurate is Luxi and Cinemeter II?

What are light meters and why would you want one for shooting video? Don’t most cameras have good built-in light meters these days? How accurate is the Luxi (attachment for your smartphone to make it act like an incident light meter) along with the Cinemeter II app (for iOS)?

Let’s have a look!

Links to gear discussed and used to record this session:

Luxi for All Incident Meter Dome for smartphones:

Luxi App (Free)



Cinemeter II App ($25 - iOS only)


Lastolite EzyBalance Gray Card (Foldable)

Sekonic L-308S-U (Typical basic incident light meter - Minolta is not longer in business but sold to Sony who does not make light meters)

Sekonic Speedmaster L-858D-U Light Meter (top of the line exposure meter)

Sekonic C-700-U Spectrometer (Color Meter, NOT an exposure meter)

Panasonic GH5 Hybrid Camera

Panasonic 12-35 f/2.8 OIS Lens (My go-to lens with the GH5)

Sound Devices MixPre-10T Audio Recorder

Sigma ART 24-70 f/2.8 Lens for Canon EF Mount


Sennheiser MKH 8050 Supercardioid Boom Microphone

Blackmagic Design Ursa Mini Pro Cinema Camera (This is my main camera for corporate video work)

Copyright 2017 by Curtis Judd