Title: FARM ENERGY
1FARM ENERGY
Energy Fundamentalsfor Farm Lighting Farm Energy
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(USDA Census of Agriculture, 2007)
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- Proper lighting should
- Provide a safe, effective working environment
- Deliver proper light level for animals
- Be energy efficient
- Be cost effective
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- Lumens
- Quantity of light output (lm)
- Average rated life
- Number of hours for half of the bulbs to burn
out in lab tests
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- Efficiency
- Lumens/Watt
- Example
- 1200 lm/20 W 60
-
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- Foot-candles (fc)
- Level of light at a working surface
- One fc is amount of illumination from a candle
falling on a surface at a distance of one foot -
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- Incandescent
- Most common currently
- Least energy efficient
- Cheapest initial cost
- Shortest life
- Being phased out from retail
- 100 W Jan 1, 2012
- 75 W Jan 1, 2013
- 60 40 W Jan 1, 2014
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- Compact Fluorescent (CFL)
- 10 times more life than incandescent
- 75 less energy usage
- Should be rated for moist and dusty environment
- Enclosure globes can shorten life
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- Light Emitting Diodes (LED)
- Five times more efficient than incandescent
- Long rated life (near 100,000 hrs)
- Directional lighting
- Currently limited in damp or dusty environments
- Improving efficiency and costs every six months
stay tuned
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- Tube Fluorescent
- T 12 (1.5 diameter)
- Phasing out (bulbs July 2012)
- T 8 (1 diameter)
- 4x more efficient than incandescent
- lt 12 off floor
- Mount electromagnetic ballast in weatherproof
fixtures - T 5 (0.6 diameter)
- Shorter and more efficient than T8
- Only good in clean-dry environments currently
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- Economic comparison example
- 23 W CFL (1600lm) vs. 100 W incandescent (1580
lm) - Used 8 hours per day (2920 hrs)
- Electricity is 0.10/kWh
CFL CFL Type of Lamp Incandescent Incandescent
23 W Input Wattage 100 W
69.6 lm/w 1600 lm/23 W Efficiency 15.8 lm/w 1580 lm/100 W
67.2 kWh 0.023 kW x 2920 hr Energy Use 292 kWh 0.1 kW x 2920 hr
6.72 67.2 kWh x 0.10 Energy cost/yr 29.20 292 kWh x 0.10
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- 23 W CFL (1600lm) vs. 100 W incandescent (1580
lm) - Used 8 hours per day (2920 hrs)
- Electricity is 0.10/kWh
CFL CFL Type of Lamp Incandescent Incandescent
23 W Input Wattage 100 W
12,000 hrs Rated life 1500 hrs
6,000 hrs 50 of rated Assumed life 750 hrs 50 of rated
0.49 bulbs 2920 hrs/6000 hrs Bulbs/yr 3.9 bulbs 2920 hr/750 hrs
3.19 Cost/bulb 0.45
1.56/yr 3.19 x 0.49 bulbs Bulb cost/yr 1.75/yr 0.45 x 3.9 bulbs
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- 23 W CFL (1600lm) vs. 100 W incandescent (1580
lm) - Used 8 hours per day (2920 hrs)
- Electricity is 0.10/kWh
CFL CFL Type of Lamp Incandescent Incandescent
23 W Input Wattage 100 W
6.72 67.2 kWh x 0.10 Energy cost/yr 29.20 292 kWh x 0.10
1.56/yr 3.19 x 0.49 bulbs Bulb cost/yr 1.75/yr 0.45 x 3.9 bulbs
8.28/yr 6.72 1.56 Annual Cost 30.95/yr 29.20 1.75
22.67/yr 30.95 - 8.28 Savings
0.14 yrs 3.19/22.67 Payback
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- Summary
- Adequate light level is important to meet basic
needs in facilities in a safe manner - There are multiple options for efficient indoor
lighting - Be aware of the impact of dust and humidity on
light in your lighting decision - Include initial cost of wiring and fixtures when
looking for cost savings - Appropriate disposal measures should be taken
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- For More Information
- Google ISU farm energy or visit us online at
- http//farmenergy.exnet.iastate.edu
- Download ISU Farm Energy publications at no
charge - Follow us on Twitter _at_ISU_Farm_Energy for updates
- Ask your local utility provider to contact us!
http//farmenergy.exnet.iastate.edu
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http//farmenergy.exnet.iastate.edu