7/29/2019 ECM216 BUILDING SERVICES Bab 1.8 Lighting

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EDITED BY

AZUAN AHMAD FAUZI 2011803188

UITM PULAU PINANG MAC 2013

LIGHTING

ILLUMINATION

Definition :

In general terms, lighting is the process of illumination or applying light to a specific venueor focus.

It also the deliberation of application of light to achieve some aesthetic or practicaleffect. Light is an electromagnetic wave that is visible and travel at 300,000 km/s.

Units

Light is an electromagnet wave that is visible & travel at 300,000 km/s Brightness of light

candela (Cd)

Brightness of light falling on an object or lux 1 lux = 1 lumen/m2 = 1 lm/m2

LIGHTING

NATURAL LIGHTING ARTIFICIAL LIGHTING

NATURAL LIGHTING

Natural lighting of interiors comes from daylight. It is directly from sun or moon orreflected by them. Daylight (through windows, skylights etc)is often used as the mainsource of light during daytime in buildings given its high quality and low cost. If a

building used only natural lighting during daytime, amount needed depends upon

daylight factor ( D.F)

Daylight factor (D.F) depends on :1) Sky condition2) Size, shape & position of windows3) Effect of obstructions4) Reflection

ARTIFICIAL LIGHTING

Artificial lighting is the one that man made. Unlike natural lighting, artificial lightingcan be control can be said controllable.

Design of artificial lighting depends upon:1. Extent of usage, alone or supplement to artificial lighting2. Specific task or general3. Glare & reflection4.

Aesthetic (i.e colour, form & effects)5. Location

6. Weight of lamp units + components7. Maintenance (i.e longevity & accessibility)8. Cost

7/29/2019 ECM216 BUILDING SERVICES Bab 1.8 Lighting

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EDITED BY

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UITM PULAU PINANG MAC 2013

TYPE OF LAMPS

1. Tungsten Filament or Incandescent uses fine tungsten wire as filament. when filament resists current,temperature rise, light out. rating : 5W 1500W & last for 1000hrs

2. Discharge Lamps Operated by passing electricity (current) through a gas or vapour. Disadvantages: take time for full brightness Advantages: last longer & better lights Two types:

1) High pressure mercury discharge lamps Use mercury vapour & 5 mins to full brightness. Orange yellow. Install at roundabout, road junctions, high risk

area

2) Low pressure sodium discharge lamps Use sodium vapour & 15 mins to full brightness White to bluish. Installed as street lighting.

Lamp life of a fluorescent lamps To indicate the life of fluorescent lamps, their useful l ife is defined. It is the time

required until the systems flux is reduced to 80% of its initial value. The systems

decrease in light flux can, however, be tracked back to the following.

o a decrease in light flux due to burning period of lamp(fatigue of fluorescent)o lamp failureo dirt accumulation.

3. Tubular Fluorescent Lampso uses low pressure mercury vapouro coating will provide various emitting light colours.o available in long tube with straight, oval, compact & circular.

4. Compact Fluorescent Lampa) CFL with build in ballast.

equipped with conventional electric ballast. have higher luminous efficacy, guaranty in immediate, flicker free and weigh

less. Mainly used in replace tungsten lamps in restaurant etc.

b) CFL with external ballast have thin parallel fluorescent tube, a built in starter and a base. low weight, small size, high luminous efficacy and long life is the advantage

of this lamp.

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EDITED BY

AZUAN AHMAD FAUZI 2011803188

UITM PULAU PINANG MAC 2013

5. High Intensity Discharge Lamp (HID)a)Mercury vapour lamp

produce by electric discharged through mercury vapour, resulting in poorquality of greenish hue.

addition of phosphor coating in the bulb improve color rendering.b)High pressure sodium lamp

manufactured with tube-shaped ellipsoidal bulbs with wattage of between50 W and 1000 W.

extremely high luminous efficacy up to 130 lm/W. radiate a yellowish colour of light and achieve bad colour rendering. main application is outdoors for the illumination of streets and car parks

c)Low pressure sodium lamp

have high efficiency (up to 180 lm/W), quite long life (up to 16000 hours)andreduced running costs.

yellow color commonly used for road lighting, parking areas etc can be used in areas where astronomical observations take place.

d)Metal halides Lamp a further development of high-pressure mercury vapour lamps. the luminous efficacy is about 95 lm/W. suitable for the energy-efficient lighting of offices, salesrooms and

window-shops.

CONTROL OF ARTIFICIAL L IGHTING

i. Switches cut out current flow by ON-OFF ii. Time control pre determine ON-OFF iii. Photo-electric detected intensity of external light to ON-OFF iv. Dimmers manually or automatically reduce Intensity of lamps v. Presence detector ON-OFF due to present or movement of life forms.