Luxi iPhone Light Meter Tested

Author: John Honovich, Published on Oct 04, 2013

Adding a free app to your smartphone to measure light levels sounds great but our recent test showed how poorly they performed. However, a new iPhone accessory, Luxi, claims to deliver far more accurate results at a fraction of the cost (online for $29.95 USD) of professional lux meters ($100+).

Here's what it looks like attached to an iPhone:

In this report, we:

  • Test Luxi's performance at default and calibrated levels against a professional Extech light meter, which acted as our baseline.
  • Compare lux measurements in a variety of scenes.
  • Offer feedback on usability and the importance of calibration.

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Comments (3)

This was an interesting little accessory. I'm curious to see if others follow with similar tools for smartphones, or how many light meter apps will add support for them.

You need a long term test to determine if this App will continue to perform well after your pro-calibration. Some poor equipment require monthly calibrations.

Luxi has actually been releasing updates to this app since we did this test claiming to improve accuracy. I've been meaning to see if it got any better. Next time we take lux measurements during testing we'll snap the Luxi on and check it quickly, but we likely won't do anything more than that.

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