what is LED

LED stands for “Light Emitting Diode” and is a kind of semiconductor, which emits light when electrified.
In other words, the LED emits light by itself and requires no filaments like incandescent lamps, which is fundamentally different from conventional light sources.
LED has long life span, however, deterioration of the sealing materials will reduce its light efficiency.
A Light Emitting Diode (LED) light source is a semiconductor. Light emitting diodes (LEDs) are used as indicator lamps in many devices, and are increasingly used for lighting. Introduced as an electronic component in the handy LED.
Researchers from around the world gathered at the Materials Research Society fall meeting in Boston last week to discuss the progress they're making in using quantum dots to enhance the color and efficiency of light-emitting diodes (LEDs). Today's white-light LEDs consist of a blue-emitting LED coated with a phosphor that is excited by the LED and emits a yellow or orange light. The combination of blue and yellow produces a cold white light lacking in red photons,

Factors influencing the deterioration of packaging resin material: -

Heat
High ambient temperature and generated heat by high electric current give rise to resin deterioration.

Light
Bigger spectrum energy increases resin deterioration.
Blue spectrum has bigger energy compared with red spectrum, therefore life span of blue color LED is shorter than others.
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what is Illuminance E ?

The unit of measurement is the lux [lx]: E = F / A F = luminous flux in lumenensA = area illuminated in m2 Illuminance E is the ratio between the luminous flux and the area to be illuminated. An illuminance of 1 lx occurs when a luminous flux of 1 lm falls evenly on an area of 1 m². Based on the definitions for illuminance luminous intensity and solid angle W = A/r2, we obtain the following formula for illuminance: E = I / r2Photometric inverse square law r = distance of the light source to the object in mA = area illuminated in m2I = luminous intensity in Candela It is assumed that the light falls perpendicular to the surface it illuminates. If the surface is at an angle a then E = I/r2 must be multiplied by cos a.