Paid app ($0.49) — only Google Play can deliver it
Measure light intensity
Illuminance - Lux Light Pro — description
Illuminance - Lux Light Pro is a simple light meter for measuring illuminances (lux) by using the light sensor of your android device.
Features: - Show the light reference range value for each type of environment - Shows the minimum, maximum and average value - Recommend the best light value in lux for each room type