Lighting Basics – Chapter 7

GLARE Glare is caused by Brightness of any objects within the visual field which is brighter than the adaptation level of eye OR A Type of visual disturbance in which high contrasts in the periphery of the field of view (from windows or unshielded lamps) distract the attention of the person working under light. It […]

Lighting Basics – Chapter 6

LIGHTING DESIGN BASICS Introduction: Design leads to accuracy. It is easy to obtain the exact numbers of selected luminaries for required lux levels with the help of design. DESIGNING WITH DIRECT LIGHTING Direct lighting uses luminaries that are designed to emit the  majority of their light output directly down on to the working plane. (Image […]

Lighting Basics – Chapter 5

LAMPS & BALLASTS   The main Lamp Types: Halogen Lamps Fluorescent Lamps (FTL) Compact Fluorescent Lamps (CFL) Metal Halide Lamps Sodium Vapour Lamps   HALOGEN LAMPS   Advantages Can be used with small fixtures (approx . 3”dia.) Higher luminous efficiency than incandescent lamps Easy to dim Low cost of ownership/investment Disadvantages Short service life High […]

Lighting Basics – Chapter 4

Colour Rendering Index (CRI) Colour Rendering Index (CRI), is a quantitative measure of the ability of a light source to reproduce the colors of various objects faithfully in comparison with an ideal or natural light source. CRI is the most important measure of a light source which defines the color characteristics. Definition in very simple […]

Lighting Basics – Chapter 3

Light Colour The Light Colour describes the Colour Appearance of the Light. Co-related to colours produced by black body radiator at different temperatures. Also Known as Co-Related Colour Temperature (CCT). Colour Temperature Appearance Association Up to 3000 K Reddish Warm 3300K – 5300K White Intermediate above 5300K Blue ish Cool Table 1.1 In a very […]

Lighting Basics – Chapter 2

Lighting Level Lighting Level has been determined / based upon three Important Aspects: By the Level Of Eye Task By the Age Of Users By Speed of Activity and Size Of the Object   Lighting Level is Determined by the “Level Of Eye Task”      Lighting Level is Determined by the Age Of Users […]

Lighting Basics – Chapter 1

What is LIGHT? Light is electromagnetic radiation(similar to radio and TV waves) travelling in space Creates sensation of ‘vision’, when enters our eyes Light is thus a perceived phenomenon & depends on the sensitivity of eye. Indoor Lighting Segments Office Lighting Industrial Lighting Retail and Hospitality Hospitals Basic Parameters Luminous Flux Luminous Intensity Illuminance Luminance […]