Lighting nilanka
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This document discusses lighting design and load estimation. It provides formulas to calculate the number of luminaires needed based on the illuminance required, room dimensions, and luminaire specifications. It also discusses selecting the appropriate transformer and cables based on the calculated lighting load. Key factors covered include recommended illuminance levels, utilization factors, maintenance factors, and single line diagrams.
Lighting nilanka
- 1. Lightning & Load Estimation
- 3. Calculate the no of luminaries
- 5. Design no of socket outlets required
- 8. Draw a single line diagram
- 10. BOQIntroduction
- 12. It is about total light emitted.
- 14. Measure the light intensity of a light source in a given direction
- 15. Illuminance
- 16. the luminous flux (lumens) falling on a surface per unit area normal to the surface.
- 17. Luminance
- 18. It is about visual brightnessCalculate no of luminariesN = (E x L x W) (NL x x MF x UL x LLd)E = Required Illuminance (Lux level) L = Room Length (m)W = Room Width (m) NL = Number of lamps in each LuminaireN = Number of Luminaires = Lamp fluxM = Maintenance FactorUF = Utilisation FactorLLD = Lamp Lumen Deterioration Factor
- 19. Required Illuminance (Lux level)Place to place change the required Lux levelDepend on type of working situationSo we can summarized the lux level
- 21. Number of lamps in each Luminaire
- 22. Lamp flux
- 23. Utilisation FactorThe amount of light reaching a point depends on the direct contribution from the luminaries and on the indirect contribution reflected from the room surfaces.
- 24. So we have to consider that indirect contribution also.
- 25. The figure indicates the reflectance of the1.Ceiling 2. Walls 3. Floor\Working plane.731 corresponds to a reflectance 0.7 for the ceiling, 0.3 for the walls and 0.1 for the working plane.
- 26. Cont….Room IndexR.I = (LXW)/ [(H1-H0)X(L+W)]Where,L = Room Length (m)W = Room Width (m)H1= Height of luminaries' light emitting surfaceH0 = Height of the working plan
- 27. Cont….
- 28. Maintenance FactorThe Maintenance Factor is defined as the ratio ofAverage illuminance on the working plane after a specified period of use of a lighting installation to the average illuminance obtained under the same conditions for a new installation. It is always less than 1. Lamp Lumen Deterioration Factors For Commonly Used Lamp Types
- 30. Design no of socket outlets requiredNo of socket outlets varies place to place in a building. we should have a better knowledge about that.
- 31. It depend user requirement
- 32. Shop
- 33. House
- 34. Office
- 35. Factory
- 36. We use 5A,13A,15A sockets.Load Estimation10*(1+(2-1)*0.2)36*12/0.7/23018*10/0.7/230
- 37. Transformer selectionWe have different size transformers30 kVA
- 38. 50 kVA
- 39. 1000kVA
- 40. 1600 kVADraw a single line diagram
- 41. Cable selectionWe can select cable size for the design load. we can get cable size using catalog.
- 42. We have to check that cable is suitable.
- 43. Selected cable must be acceptable.BOQ(Body of Quantity)