Light Temperature Meter 2.0

The application measures the light temperature of any light source by pointing the square pointer in the center of the screen into the light of the light source. The pointer should not be pointed directly to the light source, but somewhere close to it on a reflected light (it is possible to use a sheet of white paper, or point it to a white wall where the light is reflected), because a strong light source could over-illuminate the camera.

APPLICATION USES THE OpenCV LIBRARY. If you have not downloaded it yet, the application will ask you to download the OpenCV Manager.

Measurement accuracy.

The accuracy of the light temperature measurement depends on the parameters of the camera of your device, and has only an informative character. You can measure the approximate temperature of LED lights in your room or before buying, or the temperature of halogen or other light sources.
The application also displays a "Cool" or "Warm" text about the measured temperature except the temperature information. Color temperatures over 5000 K are called cool colors (bluish white), while lower color temperatures (2700 – 3000 K) are called warm colors (yellowish white through red).

Why is the application useful?

Research has demonstrated that nighttime light exposure suppresses the production of melatonin, the major hormone secreted by the pineal gland that controls sleep and wake cycles. Therefore, a reduction in melatonin at night is associated with subjective levels of sleeplessness. But melatonin suppression has far worse consequences than simply poor sleep outcomes: it has also been shown to increase the risk of cancer, impair immune system function, and possibly lead to cardiometabolic consequences such as type 2 diabetes, metabolic syndrome, obesity, and heart disease. With serious consequences like these, preventing melatonin suppression should be a top priority in anyone’s healthy lifestyle.
It is well established that short-wavelength or "blue" light is the most melatonin-suppressive; this is the type of light typically emitted by devices such as televisions, computer screens, and cellphones. To produce white light, these electronic devices must emit light at short wavelengths, close to the peak sensitivity of melatonin suppression. This means that products such as tablets, smartphones, and other devices with self-luminous electronic displays are major sources for suppressing melatonin at night, thereby reducing sleep duration and disrupting sleep.

Source: http://www.cleantechpatentedge.com/2013/03/why-color-temperature-control-is-vital-to-the-led-industry/