Technical Characteristics of various electrical lamp technologies

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Are you specifying electric lamps and you need information on the wattage and service life of the commonly used electrical lamps? Here we have listed the wattage, efficiency (lumen/watt) and service life (hours) of some commonly used electric lamps to aid in selecting the right lamps.


Lighting Technology Power (Watt) Efficiency (Lumen/watt) Service Life (Hours)
Standard Incandescent
3 - 1,000
10 - 15
1,000 - 2,000
Halogen Incandescent
5 - 500
15 - 25
2,000 - 4,000
Fluorescent tube
4 - 56
50 - 100
7,500 - 24,000
Compact fluorescent lamp
5 - 40 
50 - 80 
10,000 - 20,000
HP Mercury Vapor
40 - 1,000
25 - 55
16,000 - 24,000
High-Pressure Sodium
35 - 1,000
40 - 140
16,000 - 24,000
Low-Pressure Sodium
35 - 180
100 - 185
14,000 - 18,000
Metal halide
30 - 2,000
50 - 115
6,000 - 20,000
LED
0.05 - 0.1
10 - 30
40,000 - 100,000
Source : Schneider Electric






Common Characteristics of Lamps Used in Electrical Installations

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Below are the characteristics of the common lighting technology in use in different electrical installations. Also stated are their place of application, advantages and disadvantages:

Lighting Technology
Application
Advantages
Disadvantages
Standard Incandescent
  • Domestic use
  • Localized decorative lighting

  • Direct connection without intermediate Switchgear.
  • Reasonable purchase price.
  • Compact size
  • Instantaneous lighting
  • Good colour rendering

  • Low luminous efficiency and high electricity consumption.
  • Significant heat dissipation.
  • Short service life.
Halogen Incandescent
  • Spot lighting.
  • Intense lighting

  • Direct connection
  • Instantaneous efficiency
  • Excellent colour rendering

  • Average luminous efficiency
Fluorescent tube
  • Shops, offices, workshop.
  • Outdoors

  • High luminous efficiency.
  • Average colour rendering

  • Low light intensity of single unit.
  • Sensitive to extreme temperatures
Compact fluorescent lamp
  • Domestic use.
  • offices.
  • Replacement of incandescent lamps

  • Good luminous efficiency.
  • Good colour rendering
High initial investment compared to incandescent lamps
HP Mercury Vapor
  • Workshops, halls, hangars.
  • Factory floors

  • Good luminous efficiency.
  • Acceptable colour rendering.
  • Compact size
  • Long service life

  • Lighting and relighting time of a few minutes
High-Pressure Sodium
  • Outdoors
  • Large halls

  • Very good luminous efficiency

  • Lighting and relighting time of a few minutes
Low-Pressure Sodium
  • Outdoors
  • Emergency lighting

  • Good visibility in foggy weather
  • Economical to use

  • Long lighting time (5 mins).
  • Mediocre colour rendering.
Metal halide
  • Large areas
  • Halls with high ceilings

  • Good luminous efficiency.
  • Good colour rendering.
  • Long service life.

  • Lighting and relighting of a few minutes
LED
  • Signaling (3-colour traffic lights, exit signs and emergency lighting

  • Insensitive to the number of switching operation.
  • Low energy consumption.
  • Low temperature

  • Limited number of colors.
  • Low brightness of single unit


Typical Power Factors for Common Electrical Loads

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Power factor is very critical for calculating or measuring the electrical power consumed by an electrical device on an alternating current supply. To be able to determine electrical on alternating current (AC) systems, you need to know the power factor of the electrical load. Below is listed the  typical power factors for common electrical loads:


Electrical Load Power Factor (CosŐ“) Reactive Demand Factor (TanŐ“)
Transformers (No load condition)
0.1 - 0.15 9.9 - 6.6
Motor (Full load)
0.7 - 0.85 1.0 - 0.62
Motor (No load)
0.15 6.6



Metal Working Apparatuses:

  • Arc Welding
0.35 - 0.6 2.7 - 1.3

  • Arc Welding  Compensated
0.7 - 0.8 1.0 - 0.75

  • Resistance Welding
0.4 - 0.6 2.3 - 1.3

  • Arc Melting Furnance
0.75 - 0.9 0.9 - 0.5
Fluorescent Lamps:

  • Compensated
0.9 0.5

  • Uncompensated
0.4 - 0.6 2.3 - 1.3
Mercury Vapor Lamps
0.5 1.7
Sodium Vapor Lamps
0.65 - 0.75 1.2 - 0.9
AC DC Converters
0.6 - 0.95 1.3 - 0.3
DC Drives
0.4 - 0.75 2.3 - 0.9
AC Drives
0.95 - 0.97 0.33 - 0.25
Resistive Load
1 0