Understanding the differences between the types of lighting

  • Incandescent, Halogen, Fluorescent, LED – Which is best? Wattage is not the proper indicator for the amount of light a lamp produces. Refer to lumens for that reference.
    Also critical for lamping decisions is color temperature. Refer to the following chart for help in deciding which lamp to buy.

    Lumens
    Typical Product
    Efficiacy (lumens/watt)
    Est. Annual Energy Use*
    Est. Annual Electricity Cost*
    125
    3 watt CFL
    41
    5 kWh
    $0.60
    150
    3.5 watt LED
    43
    6 kWh
    $0.70
    185
    15 watt krypton
    12
    27 kWh
    $2.93
    210
    25 watt incandescent
    8
    46 kWh
    $5.01
    ambient lighting
    400
    9 watt CFL
    44
    16 kWh
    $1.80
    450
    8 watt LED
    56
    15 kWh
    $1.60
    460
    40 watt incandescent
    12
    73 kWh
    $8.02
    500
    10 watt CFL
    50
    18 kWh
    $2.00
    general room lighting
    800
    12.5 watt LED
    64
    23 kWh
    $2.51
    890
    60 watt incandescent
    15
    109 kWh
    $12.03
    900
    15 CFL
    60
    27 kWh
    $2.93
    1,000
    12.5 watt LED downlight
    80
    23 kWh
    $2.51
    1,180
    75 watt incandescent
    16
    133 kWh
    $15.04
    1,200
    20 watt CFL
    60
    35 kWh
    $4.01
    suitable for reading
    1,750
    100 watt incandescent
    17
    182 kWh
    $20.06
    1,750
    29 watt CFL
    60
    53 kWh
    $5.82

    How does halogen enter into this mix? As a point of reference, a 60 watt halogen lamp produces as much light as a regular 100 watt incandescent lamp.
    * Estimated annual energy use based on 5 hours per day. Estimated annual energy cost based on electric rate of $0.1099/kWh (Jan 2011 US national average)
    This table provided by EFI.

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