Lighting SAMPLE. Learner Workbook. Version 1. Training and Education Support Industry Skills Unit Meadowbank. Product Code: 5640
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1 Learner Workbook Version 1 Training and Education Support Industry Skills Unit Meadowbank Product Code: 5640
2 Table of Contents Introduction... 5 Section 1: Lighting concepts... 7 Review questions... 9 Section 2: Incandescent and low pressure mercury vapour lamps.. 15 Review questions Section 3: Lamp control circuits Skill practice 3.1: Fault finding and repair techniques Review questions Section 4: High intensity discharge lamps Skill practice 4.1: Compare characteristics Skill practice 4.2: Fault find and repair Review questions Section 5: Luminaires Skill practice 5.1: Illuminance levels of luminaires Review questions Section 6: Design of lighting systems Skill practice 6.1: Design a lighting system Review questions Section 7: Appraisal of a lighting installation Skill practice 7.1: Appraise a lighting installation Review questions Section 8: Lighting for safety Skill practice 8.1: Type and location of emergency lighting Review questions Section 9: Lighting for energy efficiency Skill practice 9.1: Research assignment Review questions Answers to review questions Appendix A Resource Evaluation Form TAFE NSW (Training & Education Support, Industry Skills Unit Meadowbank) 2012
3 Section 1: Lighting concepts Objectives At the end of this section you should be able to: Accurately use the terms and units related to the processes and concepts of illumination Identify the factors essential for visual comfort Describe the basic concepts of light production Determine illumination levels on a given area/working plane with regard to total flux Apply the inverse square law to illumination levels, luminous intensity and distance. Lighting concepts Illumination terms and units Electro-magnetic spectrum Luminous flux Luminous intensity Luminance Illumination Illuminance Visual task Task area Working plane. Visual comfort Contrast Glare Reflectance Unwanted reflection Brightness (luminosity). Terms and units used to describe the processes and concepts of illumination are explained in your textbook and in Appendix A of this module. Some common terms and units are: The visual comfort of an environment is determined by the relative degrees of: TAFE NSW (Training & Education Support, Industry Skills Unit Meadowbank) 2012 Page 7 of 120
4 Light production Production of light is achieved electrically by: Passing a current through the filament of a lamp (incandescence) The excitation of phosphors in a varying electric field (electroluminescence) The ionisation of a gas or vapour (discharge). Illumination levels The illumination level on a surface can be calculated using: E = F/A where: E = Illuminance in lux F = Flux in lumens A = Area in m 2. Inverse square law The effect on illumination levels of increasing the distance from the light source can be determined using the inverse square law. E = I/d 2 where: E = Illuminance in lux I = Luminous intensity in candelas d = Distance in metres. Page 8 of 120 TAFE NSW (Training & Education Support, Industry Skills Unit Meadowbank) 2012
5 Review questions These questions will help you revise what you have learnt in Section The wavelength of the electro-magnetic spectrum to which the human eye is most sensitive is in the region producing: Red-yellow Yellow-green Green-blue Blue-violet. 2. A light ray passing from one medium to another will change direction according to the laws of: Refraction Reflection Diffusion Polarisation. 3. Light rays are reflected in a scattered pattern from a surface which is: Polarised Matt Semi-matt Irregular. 4. Passing a current through the filament of a lamp will produce light due to: Electroluminescence Fluorescence Phosphorescence Incandescence. 5. The excitation of phosphors in a varying electric field will produce light due to: Electroluminescence Fluorescence Phosphorescence Incandescence. TAFE NSW (Training & Education Support, Industry Skills Unit Meadowbank) 2012 Page 9 of 120
6 6. Production of light in a discharge lamp occurs when the gas or vapour is: Polarised Ionised Atomised Phosphoresced. 7. The candela is the unit of: Luminous flux Luminous intensity Luminaires Illuminance. 8. The lumen is the unit of: Luminous flux Luminous intensity Luminaires Illuminance. Answer the following questions in the space provided. 9. What is meant by the following terms when used to describe an object being viewed? Contrast: Illumination: Page 10 of 120 TAFE NSW (Training & Education Support, Industry Skills Unit Meadowbank) 2012
7 Brightness (luminosity): 10. What is the difference between direct glare and indirect glare? 11. What is the difference between discomfort glare and disability glare? 12. What is meant by the following terms when used to describe an area requiring illumination? Visual task: TAFE NSW (Training & Education Support, Industry Skills Unit Meadowbank) 2012 Page 11 of 120
8 Task area: Working plane: 13. What are unwanted reflections? 14. A total luminous flux of 1000 lm falls uniformly on an area of 4 m by 3m. Determine the level of illuminance on the area. Answer: Page 12 of 120 TAFE NSW (Training & Education Support, Industry Skills Unit Meadowbank) 2012
9 15. The recommended illuminance for a classroom is 240 lux. Determine the value of useful flux incidence on the working plane if the classroom area is 280 m 2. Answer: 16. A 252 cd lamp is mounted 2 metres above a desk. Calculate the illumination on the desk. Answer: TAFE NSW (Training & Education Support, Industry Skills Unit Meadowbank) 2012 Page 13 of 120
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