10968498_827797690613980_8608197633645183244_n The lighting system/unit as a whole is called a Luminarie. Luminaries provide glare control, modified light distribution and electricity circuits to the lamp/light source embedded within it. They also provide support to the lamp. The luminarie directs light to where it is needed in terms of distribution and shields the light source from causing glares.  Continue reading


steelwool-458836_1280What is Photometrics? No it is not about clicking photographs nor has it anything to do with your awesome photogenic face, neither it is the number of selfies you can click in a minute. It is a far more serious thing. It is the science of measuring light.

O’ course you cannot measure light with the help of a ruler, or a weight scale.  It is a little more complicated than that. To begin with you need to understand five terms associated with measuring light. Intensity, Flux, Illuminance, Exitance and Luminance. Continue reading

Light Control

10690089_820739877986428_2223749043000119969_nLight sources that have built in optical systems are called Directional Sources or Reflector lamps. Ar, MR, PAR and R lamps are a few examples. Light sources which lack such in-built systems require external devices to modify the direction of light in order to make them useful for architectural applications.
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Auxiliary Equipment

10428415_821171041276645_8033081424772988665_nAll discharge lamps and low-voltage incandescent lamps require auxiliary equipment to provide them with electric current to light up.

Auxiliary equipments are of two types, Ballasts and Transformers. Both consume a little amount of power, adding to the total wattage of the Light Source. Continue reading

Discharge Lamps

10898139_814029441990805_3365697142767661535_nElectric Discharge lamps work by passing electric current through vapour or gas.

The light produced by passing electric current through vapour or gas is of a higher intensity than light produced by passing electricity through filaments. Electric Discharge Lamps are more efficient and have a longer life than filament based lamps (Incandescent lamps). Continue reading

Incandescent Lamps

1549437_801765636550519_5193755077998371324_nSimply put, the Incandescent lamp is a hot metal wire (filament) inside a glass jar (the bulb).

‘Incandescent’ means emitting light as a result of being heated, which is how this type of lamp works. Electric current is passed through the wire, which heats up and emits light. The length and diameter of the wire determines the amount of electricity needed to heat the wire and thereby the output intensity of light.  Continue reading


buildings-123780_1280The purpose of Daylight in design is to provide visual variety to the interiors by using it as a source of brightness contrasts. 

The principal characteristics of Daylight is that it changes with the time of day and year; even surrounding objects, pollution and position of the house will affect how daylight can be utilized as a part of design.  Continue reading


10906430_815468545180228_8668884640471621735_nColour is not a physical property of the objects we see, but the light that is reflected back by the surface/object.

Colour results from light waves bouncing off an object; in the case of transparent or semi-transparent objects it would result from light waves passing through it. Therefore the material of the object/surface determines the colour.  Continue reading


q1We all know what Brightness is. However, let’s get a bit technical: In the world of Lighting Design, specifying the direction and distribution of light in a space yields Brightness contrast. Simply put determining the intensity and spread of light over an area results in Brightness levels. Continue reading

Perception of Light

10940638_820303284696754_2803805819512888359_nIt is a truth universally acknowledged that when there is light we see things and in darkness we don’t. This simple observation leads us to wrongly believe that our eyes perceive the world around us through the amount of light present. Whereas in reality our eyes perceive the world around us by the quantity of contrast present in the light and not the quantity of light itself! Let us find out how. Continue reading