Light Meter - lux and foot candle measurement tool

Name: Light Meter - lux and foot candle measurement tool
Price: 1.99 USD
Rating: 3.8 (120 reviews)
Author: Marina Polyanskaya

Utilities

$1.99 · Designed for iPad

120 Ratings
Ages

4+
Years
Category

Utilities
Developer

Marina Polyanskaya
Language

EN
+ 5 More
Size

25.3
MB

Light meter in your pocket! The only app you really need to measure light intensity. Calibrated with professional Illuminometer. Features: - Realtime measurements - One-time measurement - Average and Max values - Indoor and outdoor modes - Front and rear cam - Lux and Foot candle measurements Please note that Light Meter app is not a replacement for a professional device and should be used for private purposes only. Have any questions or suggestions? Write to us: support@lspapps.com

Ratings & Reviews

3.8

out of 5

120 Ratings

Make sure you use the best camera on your phone.
02/27/2021

eatmyduce
My I phone has a front and back side camera. I have a screen protector on the face that affects the readings. I make sure I use the back side camera for most accurate results with this app. Can’t speak to accuracy compared to a standard. This app works great for my needs.
Make sure you use the best camera on your phone.
02/27/2021

eatmyduce

My I phone has a front and back side camera. I have a screen protector on the face that affects the readings. I make sure I use the back side camera for most accurate results with this app. Can’t speak to accuracy compared to a standard. This app works great for my needs.
No customer service. Indoors vs outdoors odd. No color temperature.
01/21/2017

Gentle Explorer
Do not expect customer service to ever answer any questions or emails.Light levels are absolute levels of brightness. Therefore, it's very odd that there is an indoor/outdoor button to set. The two settings get very different readings. Why? It should not matter whether the reading is indoors or outdoors. The number is simply a function of how bright it is.Other apps on the App Store will also tell you what the color temperature of the light is. That can be very useful in knowing whether it's bluish or yellow-ish. This app does not give you that.

Developer Response
Hi,thank you for using Light Meter and sorry for inconvenience. The app is using Neural Networks to measure light levels. Since we don't have access to the light sensor directly we have to approximate measurements from camera readings. And you're right i'm using brightness level to measure but not only. Exposure time. F-number and other readings. While calibrating i noticed that my neural network shows better results if I split measurement modes into indoor/outdoor. It helped me to improve precision. At the moment sum squared error is about 9% on 5000+ calibration samples. I bet it's the best result on App Store. And thank you for a nice idea. I'll add color temperature measurement mode with upcoming update.
No customer service. Indoors vs outdoors odd. No color temperature.
01/21/2017

Gentle Explorer

Do not expect customer service to ever answer any questions or emails.Light levels are absolute levels of brightness. Therefore, it's very odd that there is an indoor/outdoor button to set. The two settings get very different readings. Why? It should not matter whether the reading is indoors or outdoors. The number is simply a function of how bright it is.Other apps on the App Store will also tell you what the color temperature of the light is. That can be very useful in knowing whether it's bluish or yellow-ish. This app does not give you that.
Developer Response 04/04/2017
Hi,thank you for using Light Meter and sorry for inconvenience. The app is using Neural Networks to measure light levels. Since we don't have access to the light sensor directly we have to approximate measurements from camera readings. And you're right i'm using brightness level to measure but not only. Exposure time. F-number and other readings. While calibrating i noticed that my neural network shows better results if I split measurement modes into indoor/outdoor. It helped me to improve precision. At the moment sum squared error is about 9% on 5000+ calibration samples. I bet it's the best result on App Store. And thank you for a nice idea. I'll add color temperature measurement mode with upcoming update.
Light meter very good
09/25/2018

DhSrMac683
I spent over 60 years in electro optical engineering, and this is by far the best two dollars I ever spent. I agree the color temperature would be a big plus, and to be able to see the image would be very helpful to get things pointed the right way.
Light meter very good
09/25/2018

DhSrMac683

I spent over 60 years in electro optical engineering, and this is by far the best two dollars I ever spent. I agree the color temperature would be a big plus, and to be able to see the image would be very helpful to get things pointed the right way.
Amazing!!
07/16/2017

Better Engineer from Jersey
Disregard any negative comments! From an app developer standpoint I appreciate the effort put into this app. For reading light values from a camera, this is very accurate. Buying this app you have to know that it's coming from an iPhone, not a comercial light meter! Great job!
Amazing!!
07/16/2017

Better Engineer from Jersey

Disregard any negative comments! From an app developer standpoint I appreciate the effort put into this app. For reading light values from a camera, this is very accurate. Buying this app you have to know that it's coming from an iPhone, not a comercial light meter! Great job!