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
  * 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)