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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