You want to know the current brightness level in your environment to adjust accordingly. You don't need to buy an expensive LUX Light Meter, you can use your own smartphone as a lux Light Meter app. light meter, lux meter application is a free tool to measure light intensity (Lux/Fc). With this lux app, you can now light measure the brightness level at work, school, home or anywhere with your smartphone. lux Light Meter is the best lux meter app for measuring light intensity using proximity sen