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Web: www.laitalight.com
Lightup Lighting Technology Co,Limited
Address: NO.586 Bingjiang dong Road, Haizhu district, Guangzhou, China, Post: 510000
Tel/Fax: 86-760-87562329
Email: inquiry@upleds.com
LED manufacturers are expected to reach 100,000 hours LED life MTBF (mean time between failures , the standard measurement of lamp life of traditional lamps used by the manufacturer ) . However , like all basic light sources , LED 's lumen depreciation over time and decay.
So, while LED lighting time can be very long , MTBF is not the only consideration in determining useful life . LED lumen depreciation is affected by many environmental conditions such as temperature, humidity and ventilation . Lumen depreciation is also under control , thermal management , current levels , and many other electrical design considerations.
LED light-emitting angle into effective and practical angle light angle . The angle between the axial direction of the light emission (normal ) value of the luminous intensity is half the axial strength of the effective value of the angle . 2 times the half-value angle Perspective (or half-power angle ) is the actual light angle . Than half of the axial angle of the light intensity is too weak because the application is not included in the effective angle .
Therefore, consumers should pay attention to when purchasing products emitting angle actual product , the calculation of the number of products used in the project , subject to the actual light angle , the effective light angle can only be used as a reference value.
LED light-emitting luminance measured intensity , luminous intensity is fingering line ( refer to the cylindrical axis of the arc tube ) in the direction of the luminous intensity , per unit solid angle of the emitted light flux , in candelas (Candela, cd). Due to the small general LED luminous intensity , luminous intensity so common milli candela (mcd) for the unit .
Generally, the light will be emitted in different directions with different luminous flux intensity in the visible radiation intensity in a specific direction unit solid angle of emitted light intensity that is called , for short axial brightness.
The concept how the introduction of the electric power from the power at equal time to do work , the current acting fast, the electric power is large ; current acting slow , the electric power is small , or said in a time equal to the current work done , the more electric power greater , the LED is not greater the power , the higher the product brightness .