Light is electromagnetic radiation that is visible to the human eye only in the range of about 400

Light is electromagnetic radiation that is visible to the human eye only in the range of about 400 to 750 nm (nanometers) This electromagnetic radiation is measured in three ways: - light intensity (defined no led by the human eye as light intensity), measured in cd (candelas in the past and candles) Here are some examples: Plain candle cd = 1 Normal lamp 100 watts = 100 cd CFL energy saving bulbs 20 watts = 100 cd Saving no led LED Lamps 5 watts = 30 cd - Wavelength (perceived to to the human eye as a color of light) no led depending on the wavelength of the human eye perceives it as a different color. color red wavelengths ~ 700-630 nm ~ 630-590 nm orange yellow green ~ 590-560 nm ~ 560-490 nm blue violet ~ 490-450 nm ~ 450-400 nm - Polarization of light - light polarization is not visible to the human eye, can be seen if you use different filters to measure various aspects of light and everything related to lighting used several units-power of luminous flux is measured no led in lm (lumens) Here are some examples: Plain candle = 11 lm Standard lamp 100 w = 1100 lm Saving CFL Bulbs 20 w = 1100 lm - Color temperature is measured K (Kelvin) degrees - Degrees show how temperature should be heated no led black body (this is theoretical concept in nature does not exist) to emit light that color here are some examples: Normal Normal candle lamp 1900 K 2700 K CFL energy saving bulbs from 2700 to 6500 K Average daylight 5500K - Illuminated measured in lx (lux) When illuminate one square meter a luminous flux of 1 lm force one meter distance is assumed that the brightness is 1 lx
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