gar
Senior Member
- Location
- Ann Arbor, Michigan
- Occupation
- EE
130929-0746 EDT
For my notes "Reading, Collecting, and Using DTE Smart Meter Data to Help Reduce Energy Use" I have run some new comparison measurements of power and light intensity on samples of Incandescent, CFL, and LED bulbs. See http://beta-a2.com/energy_c.html for a summary of the notes.
This experiment uses an 8" rim diameter aluminum reflector assembly, a Variac for voltage adjustment, a Kill-A-Watt EZ watt and volt meter, and a GE selenium cell light meter.
The reflector rim to light meter distance was 36", and voltage 120.7 V.
Only one sample of each bulb was used, but prior experiments with bulbs do not show large differences between comparable bulbs.
The bulbs were:
1. GE standard 120 V 75 W incandescent from at least 1970 to 2010 date of manufacture. Has only had testing use with negligible hours of on time. Average life was probably 750 hours. Cost unknown.
2. Phillips DuraMax Soft White A19 830 lumens 120 V 60 W incandescent brand new. Average life 1096 hours. Capital cost $0.50. Capital cost per 1000 hours of life $0.46 . At $0.16/kWh the operating cost per 1000 hours is $9.60 . Total cost per 1000 hours is $10.06 .
3. Home Depot Ecosmart Soft White 405 101 EDXO-19 2700 K CFL 1200 lumens 75 W equivalent 120 V 19 W 0.32 A actual rating. Average life 10,000 hours. Capital cost $1.50 . Capital cost per 1000 hours of life $0.15 . At $0.16/kWh the operating cost per 1000 hours is $3.04 . Total cost per 1000 hours is $3.19 .
4. Cree BA 10-04527OMF-12DE26-1U_00 2700 K LED 450 lumens 40 W equivalent 120 V 6 W 0.05 A actual rating. Average life 25,000 hours. Capital cost $9.97 . Capital cost per 1000 hours of life $0.40 . At $0.16/kWh the operating cost per 1000 hours is $0.96 . Total cost per 1000 hours $1.36 . Multiply these values by 1.5 for an approximate equivalent for 60 W replacement. Estimated 60 W equivalent cost per 1000 hours is $2.04 .
The results:
120.7 V all tests.
1. 75 W GE old incandescent
...... 31 FC .... 75.3 W ..... 1.00 PF
2. 60 W Philips new incandescent
...... 28 FC .... 62.0 W ..... 1.00 PF
3. 19 W CFL
...... 28 FC .... 18.0 W ..... 0.56 PF
1. 6 W Cree LED
...... 20 FC .... 05.5 W ..... 0.98 PF
multiply by 1.5
...... 30 FC .... 08.3 W
The 19 W CFL has comparable light output to the 60 W Phillips at 29% the power input.
The 6 W LED when adjusted to provide an equivalent light output to the 60 W Phillips used 13.4% of the 60 W bulb's power.
Neither the CFL or LED should be operated in a confined space. Use an incandescent inside refrigerators, in range top hoods, and inside ovens. Ceiling can light fixtures may shorten the life of CFLs and LEDs.
.
For my notes "Reading, Collecting, and Using DTE Smart Meter Data to Help Reduce Energy Use" I have run some new comparison measurements of power and light intensity on samples of Incandescent, CFL, and LED bulbs. See http://beta-a2.com/energy_c.html for a summary of the notes.
This experiment uses an 8" rim diameter aluminum reflector assembly, a Variac for voltage adjustment, a Kill-A-Watt EZ watt and volt meter, and a GE selenium cell light meter.
The reflector rim to light meter distance was 36", and voltage 120.7 V.
Only one sample of each bulb was used, but prior experiments with bulbs do not show large differences between comparable bulbs.
The bulbs were:
1. GE standard 120 V 75 W incandescent from at least 1970 to 2010 date of manufacture. Has only had testing use with negligible hours of on time. Average life was probably 750 hours. Cost unknown.
2. Phillips DuraMax Soft White A19 830 lumens 120 V 60 W incandescent brand new. Average life 1096 hours. Capital cost $0.50. Capital cost per 1000 hours of life $0.46 . At $0.16/kWh the operating cost per 1000 hours is $9.60 . Total cost per 1000 hours is $10.06 .
3. Home Depot Ecosmart Soft White 405 101 EDXO-19 2700 K CFL 1200 lumens 75 W equivalent 120 V 19 W 0.32 A actual rating. Average life 10,000 hours. Capital cost $1.50 . Capital cost per 1000 hours of life $0.15 . At $0.16/kWh the operating cost per 1000 hours is $3.04 . Total cost per 1000 hours is $3.19 .
4. Cree BA 10-04527OMF-12DE26-1U_00 2700 K LED 450 lumens 40 W equivalent 120 V 6 W 0.05 A actual rating. Average life 25,000 hours. Capital cost $9.97 . Capital cost per 1000 hours of life $0.40 . At $0.16/kWh the operating cost per 1000 hours is $0.96 . Total cost per 1000 hours $1.36 . Multiply these values by 1.5 for an approximate equivalent for 60 W replacement. Estimated 60 W equivalent cost per 1000 hours is $2.04 .
The results:
120.7 V all tests.
1. 75 W GE old incandescent
...... 31 FC .... 75.3 W ..... 1.00 PF
2. 60 W Philips new incandescent
...... 28 FC .... 62.0 W ..... 1.00 PF
3. 19 W CFL
...... 28 FC .... 18.0 W ..... 0.56 PF
1. 6 W Cree LED
...... 20 FC .... 05.5 W ..... 0.98 PF
multiply by 1.5
...... 30 FC .... 08.3 W
The 19 W CFL has comparable light output to the 60 W Phillips at 29% the power input.
The 6 W LED when adjusted to provide an equivalent light output to the 60 W Phillips used 13.4% of the 60 W bulb's power.
Neither the CFL or LED should be operated in a confined space. Use an incandescent inside refrigerators, in range top hoods, and inside ovens. Ceiling can light fixtures may shorten the life of CFLs and LEDs.
.