Lighting. Wednesday , April 19th , 2017 - 01:19:32 AM
Aside from the light emitted being of extremely high quality they also have several other advantages which have led many people to make the switch. First off, they're extremely efficient and in turn they waste much less energy. Second, they suffer very little wear and tear and have an estimated lifespan somewhere in the range of 100 000 hours. Another plus is their compact size and the through the fact that they waste very little energy they are typically cool to the touch. Unlike fluorescent lights which contain mercury, LED lights are completely nontoxic. Finally, LED lights are solid state components and thus are very difficult to damage with an external shock as opposed to both incandescent and fluorescent lights which are both easily damaged.
The brightness of the LED is measured by the luminous intensity. The luminous intensity refers to the luminous intensity in the direction of the normal (for the cylindrical tube), that is, the luminous flux emitted by the unit solid angle, in candlelight (Candela, cd). As the general luminous intensity of LED is small, so the luminous intensity commonly used in Mendra (mcd) as a unit. In general, the light source will be different directions to different intensity of its luminous flux, in a specific direction of the unit angle generated by the visible light radiation intensity is called light intensity, referred to as axial brightness.
Through the ages man has been fascinated by fire since its discovery. Man attempted to harness the power of flame to provide both heat and light. As knowledge about fire evolved, fire became portable. Used to light the interior of caves and dark natural passageways in dense woods, portable fire was both dangerous and unpredictable.
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