Question 1. Define Luminous Flux?
It is described as the entire amount of mild electricity emitted according to second from a luminous body.
It is represented by using image F and is measured in lumens.
The concept of luminous flux enables us to specify the output and efficiency of a given mild supply.
Question 2. What Is Meant By Luminance?
It is described because the luminous consistent with unit projected area of both a surface source of mild or a reflecting floor and is denoted by way of L.
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Question three. What Are The Laws Of Illumination?
Law of Inverse squares:
Illumination at a point is inversely proportional to square of its distance from the factor supply and without delay proportional to the luminous intensity (CP) of the source of light in that route.
If a supply of mild which emits light equally in all instructions be placed at the centre of a hollow sphere, the light will fall uniformly on the inner surface of the field.
If the sphere get replaced by means of one among the bigger radius, the identical general quantity of mild is unfold over a bigger vicinity proportional to the square of the radius.
Lambert’s cosine regulation:
The illumination at a point on a floor is proportional to cosine of the angle which ray makes with the everyday to the normal to the surface at that point.
Question 4. What Is Meant By Candle Power?
It is defined as the wide variety of lumens given out by the supply in a unit solid attitude in a given path.
It is denoted by CP
Cp = lumens /ω
Question five. Define Mhcp?
The mean of candle power in all directions in the horizontal plane containing the source of light is termed as Mean Horizontal Candle Power.
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Question 6. What Are All The Sources Of Light?
As in line with the precept of operation the light resources can be grouped as follows:
High temperature Lamps
Gaseous Discharge Lamps
Fluorescent type Lamps
Question 7. Define Utilization Factor?
It is described as the ratio of overall lumens attaining the working aircraft to overall lumens given out by way of the lamp
utilisation issue = [Total lumens reaching the working plane] / [Total lumens given out by the lamp]
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Question 8. Name The Various Photometer Heads?
Bunsen head or Grease spot photometer
Lummer-brodhun photometer head
There are two varieties of lummer brodhun heads:
Equality oc Brightness type photometer head
Contrast kind photometer head
Question nine. What Is Polar Curve?
In maximum lamps or assets of mild the luminous depth is not the same in all directions.
If the luminous depth, ie, the candle energy is measured in a horizontal aircraft about a vertical axis and a curve is plotter among candle electricity and the angular position, a curve obtained is referred to as as horizontal polar curve.
The luminous intensity in all of the guidelines may be represented with the aid of polar curves.
If the luminous depth in a vertical plane is plotted against function, a curve referred to as vertical polar curve.
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Question 10. Define Space-height Ratio?
It is defined because the ratio of horizontal distance among adjacent lamps and top of their mountings.
Space-peak ratio = [Horizontal distance between two adjacent lamps] / [Mounting height of lamps above working plane]