general lighting :

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[size=21]* task lighting: [/size]

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* accent lighting:

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1-incandesent lamps

Advantages

Low intial cost

Excellent color rendering

Instant starting

Small size

Requires no ballast

Dimming capability

Disadvantages

Low efficiency(10% goes to light)

Create high temperature

Small increase above rated voltages ,will reduce the life time

2-fluorescent lamps

Advantages

4-5 times more efficient than incandescent

10-20 times life time greater than incandescent

Low cost

Available in wide ranges of sizes

Available in wide ranges of colors

Disadvantages

Most lamps are relatively large and requires relatively expensive fixture

Fluorescent lamps are temperature sensitive

Requires special ballast at dimming system

3-High pressure sodium

Advantages

7 times as efficient as fluorescent ,2 times as efficient as mercury vapor

Warm up is 3-4 minutes

Long life time 24000 hours

Can operate at any position

Wide range of wattages 35-1000 watt

Disadvantages

The light produced is golden white

Requires ballast

Take 5-10 minutes to reach full light output at starting

4- Low pressure sodium

Advantages

14000-18000 life time

Restart immediately after interruption of power supply

Provide superior uniformity of light

Commercially lamps(efficacy 100-185 lumen per watt)

Disadvantages

Poor color rendering

Very expensive

Run time to full light output is the longest

Requires special burning position 5-Metal Halide

Advantages

Relative long life

Good color rendering

Light output is a bright crisp white light

2 times more efficient than mercury lamps and 6 times more efficient than incandescent

Disadvantages

Short life (6000-20000 hours)

Horizontal position may reduce lamp life

Color may vary from lamp to lamp

Requires ballast

Some lamps requires 2-5 minutes to wam up

6-Mercury vapor

Advantages

3 times more efficient than incandescent available in wide ranges of ratings ,colors.sizes and shapes

Relatively low unit cost

Disadvantages

Requires 5-7 minutes to warm up

Requires 4-5 minutes to cooling and restart

Its ballast is noicy

Specially ballast is required yo dim mercury lamps