[ebs001]

I can't find anything to suggest that lumens are any different for LEDs. Wiki gives a generic LED a rating of 100 lumens per watt. So a 3W LED would produce 300 lumens. A 60W incendecent gives 660 lumens on their chart. They were doing a cost comparison and listed a 9W LED. I would say that Dr. LED is wrong in their figures. Maybe the name should be Miss LED.

 

[ebs001]

Here's a price comparison of various light sources. I cannot get it as a chart so read it top to bottom under each heading ie incandescent/$2(19)/60/660/11etc

Cost Comparison

Incandescent

Halogen

Fluorescent

LED (Generic)

LED (Philips)

LED (Philips L-Prize)

Purchase price

$2[19]

$4[20]

$4[21]

$20[18]

$25[22]

$50[23]

Electricity usage

60 W

42 W

13 W

9 W

12.5 W

10 W

Lumens

660

570

660[24]

900

800

940

Lumens/Watt

11

13.6

50.8

100

64

94

Color Temperature Kelvin

2700

3100[25]

2700

3000

2700

2700

CRI

100

100

82

>75[26]

85

92

Lifespan (hours)

2,000

3,500

8,000

25,000

25,000

30,000

Bulb cost over 10 years - @6hours/day

$21.90

$25.03

$10.95

$17.52

$21.90

$36.50

Energy cost over 10 years - @15cents/kWhr

$197.10

$137.97

$42.71

$29.57

$41.06

$32.85

Total

$219.00

$163.00

$53.66

$47.09

$62.96

$69.35

Comparison based on 6 hours use per day (21,900 hours over 10 yrs)