Lighting terminology

Panasonic.net

Some of the terminology used in lighting practice and analysis, and in studying the environmental effects of light, are not commonly used elsewhere, or have different meanings when used in this context. Some terms are commonly used when talking about lighting practice, but have different meanings to different people; this is a frequent source of talking cross-purposes in our field.

LED Technology

LEDs

Light emitting diodes, These are electronic components that produce light by conversion of electrical energy directly to light by the movement of electrons within the material of the diode. They are important because due to their efficiency and low energy, they are beginning to replace most conventional light sources.

 The P-N junction is the basis of the functioning of the LED.  The LED has an anode and a cathode separated by a crystal of semiconductor material. Addition of impurities to the semiconductor material produces P-N junctions within the chip. The entire assembly is housed within a plastic cover that can also double up as a lens to guide the light emitted by the LED.

Lighting Behavior

Lighting Behavior:

- Reflection
-  Absorption 
- Transmission
-  Refraction
- Interference

Lighting Basics

What is the Lighting ? 

Light is that part of the electromagnetic spectrum that is perceived by our eyes. The wavelength range is between 380 and 780 nm.