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Chapter 4.10 - Lighting Systems

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Selected questions Chapter 4.10: Lighting Systems Short type questions 1. Define Installed Load Efficacy? Ans. Installed Load Efficacy is the average maintained illuminance provided on a horizontal working plane per circuit watt with general lighting of an interior. Unit: lux per watt per square metre (lux/W/m ) 2. Define Lamp Circuit Efficacy? Ans. Lamp Circuit Efficacy is the amount of light (lumens) emitted by a lamp for each watt of power consumed by the lamp circuit, i.e. including control gear losses. This is a more meaningful measure for those lamps that require control gear. Unit: lumens per circuit watt (lm/W) 3. Define Installed Power Density? Ans. The installed power density per 100 lux is the power needed per square metre of floor area to achieve 100 lux of average maintained illuminance on a horizontal working plane with general lighting of an interior. Unit: watts per square metre per 100 lux (W/m /100 lux) N.B. Installed power density (W/m /100 lux) = 4. 100 Installed load efficacy ( lux / W / m ) What do you understand by Colour Rendering Index? Ans. Colour Rendering Index (CRI) is a measure of the effect of light on the perceived colour of objects. To determine the CRI of a lamp, the colour appearances of a set of standard colour chips are measured with special equipment under a reference light source with the same correlated colour temperature as the lamp being evaluated. If the lamp renders the colour of the chips identical to the reference light source, its CRI is 100. If the colour rendering differs from the reference light source, the CRI is less than 100. A low CRI indicates that some colours may appear unnatural when illuminated by the lamp. 5. Define Room Index and minimum number of measurement points? Ans. Room Index is defined as follows: Room Index: RI = LxW Hm (L + W ) Where L = length of interior; W = width of interior; Hm = the mounting height, which is the height of the lighting fittings above the horizontal working plane. The working plane is usually assumed to be 0.75m above the floor in offices and at 0.85m above floor level in manufacturing areas. It does not matter whether these dimensions are in metres, yards or feet as long as the same unit is used throughout. The minimum number of measurement points can be ascertained from the table below: 4.10 - Lighting systems (table format) 59

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