In this article we will discuss about the nature of light. Lighting is one of the major uses of electrical energy. Sun is the biggest source of natural light. Artificial lighting may be electrical or non-electrical. Where there is no natural light, use of artificial light is made. Artificial lighting produced electrically has advantages like cleanliness, ease of control, reliability, [...]
A number of methods have been employed for lighting calculations, among which may be mentioned as: 1. Watts for Square Meter Method 2. Lumen or Light Flux Method 3. Point to Point or Inverse-Square Law Method. 1. Watts for Square Meter Method: This is principally a "rule of thumb" method, very handy for rough calculation or checking. It consists in [...]
The following points highlight the five main points to be kept in mind while making choice of lighting system for street lighting. The points are: 1. Initial Cost and Cost of Replacements 2. Life of Lamp 3. Operational Costs 4. Quality of Light 5. Efficiency. 1. Initial Cost and Cost of Replacements: The tungsten filament lamp is the cheapest with [...]
In this article we will discuss about the types of interior lighting schemes and the factors that are required to be considered while designing the lighting scheme. Types of Lighting Schemes: i. Direct Lighting: It is most commonly used type of lighting scheme. In this lighting scheme more than 90 percent of total light flux is made to fall directly [...]
Here is an experiment on the ‘Sources of Light’ especially written for school and college students. Aim of the Experiment: Study of different types of sources of light and make connections, and measure intensity of light with lux meter. Objective: To measure the intensity of light with lux meter of: (i) Fluorescent lamp (ii) H.P. mercury vapour lamp (iii) H.P. [...]