Research during the last ten years shows that the physiological and psychological effects of artificial lighting are very significant and quantifiable. The composition of quality of light is perhaps the most important factor, affecting health, temperament, and the ability to see clearly.

Not all "full spectrum" lights are true full spectrum lights.

Sunlight and artificial sources of light are measured by color temperature (K) and rendering (CRI). Color temperature has no relationship to room temperature and pertains only to the appearance of the light source. Color temperature refers to the temperature in degrees Kelvin at which a black body, a theoretical perfect radiator, would have to be heated to match most nearly the perceived color of the light source. For example, most cool white fluorescent lights cast a yellowish or green tint and measure between 4200K and 4500K. If you were to consider the intensity of the sun at noon daylight, it is about 5500 degrees Kelvin (K). Natural daylight is measured at a color rendering index (CRI) of 100, which shows the vibrance and intensity of colors in and around our environment

These ratings are required to determine the type of light.

Natural light has a unique spectrum, which includes a balance of UV and visible color regions. This spectrum balance of UV and Visible light is necessary for lamps to be called "full spectrum".

What's the difference between full spectrum and standard fluorescent lamps?

Sunlight is very intense electromagnetic energy in a continuous spectrum of colors ranging from the short wavelengths of invisible ultraviolet light (UV) through blue, green, yellow, and into the infrared waves.

Conventional fluorescent lamps do not have the same distribution of colors as sunlight. Widely used fluorescent lights peak in the yellow-green portion of the spectrum:

Four observations:

1. Notice how the yellow and green peaks. 

2. Notice the lack of color spectra, in comparison to the other lights

3. operating with alternating current of high frequency and distinguish themselves by the monotony of their colour-temperature

4. Additionally, conventional indoor lighting lacks the proper proportion of near-UV radiation of the sun that advocates claim to be vital to health and well being.

Our full spectrum fluorescent light emits light in all parts of the visual spectrum and some in the ultraviolet range (short-wavelength, high-energy light):

The photobiologic action spectra of greatest importance to humans ranges from 290 to 770 nm.  This full spectrum fluorescent illumination also provides substantially all of the spectral energy distribution.

Sun and daylight have a continuous stream of light. Consequently there is not a 50 hertz frequency as it is the the case with alternating current with 100 zero transitions per second.

At sunrise it comes out to 3.400 Kelvin, by midday it rises up to 5.500 Kelvin and by the evening it is back to 3.400 Kelvin.