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RGB light reflection in the sky partial rainbow

RGB light reflection in the sky partial rainbow


What is light?

The sun produces electromagnetic radiation which we know as radio waves, X-rays, UV rays, visible light etc. The only radiation humans have evolved to see is in the visible light spectrum. Everything we see around us is a reflection of this visible radiation.



Light created by the sun has a full spectrum of visible and invisible radiation. UltraViolet (100nm - 400nm) and Infrared (700nm - 1mm) radiation are both undesirable in light used for human vision because it can be harmful to your health as well as a waste of energy.

The visible "white" light (400nm - 700nm) we are used to from the sun is created by the combination of wavelengths in the red, green and blue light spectrum. The strength of each wavelength determines the colour temperature. Analysing light with a Spectrometer gives us a visual representation of this distribution.


Visible sunlight is considered white light, but it varies throughout the day. For example, at sunset the dominant wavelengths are in the red spectrum, so anything illuminated by the sun appears warmer (red/orange) and creates a relaxing mood. Midday light has a more balanced spectrum, resulting in a cooler, more stimulating atmosphere. Analysing the spectrum of different light sources helps us to visually understand the differences and why some light just doesn't seem natural to us.

Sunlight Spectrum

2800K - Sunset

4000K - After sunrise / Before sunset

5000K - Midday

7000K - Overcast

1800K - Fire

2700K - Incandescent lamp

2700K - Compact Florescent Lamp (CFL)

1900K - High Pressure Sodium Lamp (Orange street lighting)

LED Light Spectrum

2700K - MRACEK GU10

2700K - Common LED Lamp

4000K - MRACEK GU10

5000K - MRACEK D-Series