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Choosing the Right Bulb: A Guide to Wattage and Lumens

Selecting the right light bulb can be confusing. This guide clarifies key terms such as watt and lumens. Wattage indicates the energy consumption of a bulb, not its brightness. For instance, a bulb that uses 11 watts does not produce the same brightness as one that uses 40 watts. Lumens measure the amount of light emitted; more lumens mean a brighter bulb. Understanding these concepts can help you choose the best bulb for your needs while optimizing energy efficiency.

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Choosing the Right Bulb: A Guide to Wattage and Lumens

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  1. Which Bulb To Choose?

    2010 Family and Community Education Martha Keel, Ph.D.
  2. Confused?
  3. Lighting Terms Watt The amount of electricity a light bulb uses to produce light = It’s not an indication of brightness! 11 watts 40 watts
  4. Lighting Terms Lumens The amount of light given off (sometimes labeled light output)
  5. How Much Light Do I Need?
  6. Lighting Terms Color Measured on a Temperature Scale called Kelvin (K)
  7. Lighting Terms Life The expected life span of a burning bulb given in hours 8000 2000 hours hours
  8. Lighting Terms Shape A-shape Spiral Globe Tubed Candle Indoor Reflector Outdoor Reflector
  9. Lighting Terms Bases Most common: Medium & Candelabra
  10. Light Bulb Types Incandescent Inexpensive Good color Work well with devices Produce heat Short life
  11. Light Bulb Types Halogen Last longer Don’t dim with age Produce extreme heat
  12. Light Bulb Types Fluorescent Efficient Long life Many colors, types and sizes Quiet electronic ballasts Contain mercury
  13. Light Bulb Types Compact Fluorescent Lights (CFLs) Standard bases Efficient Long life Quick start time Color Brightness
  14. Light Bulb Types Solid State – LED Most efficient Very long life Colored light Expensive Not readily available for residential use
  15. How Much Can I Save?
  16. CFL Issues Starting time Quick turn on time “instant on” Color Wide variety Bulb position Outdoor use There are large differences in light, cost and turn-on time among different manufacturers.
  17. CFL Issues Flicker Health effects Ultraviolet (UV) radiation Mercury Disposal http://www.epa.gov/bulbrecycling Broken bulbs http://www.epa.gov/mercury/spills/index.htm
  18. What’s the Difference? *Based on a 6,000-hour CFL, a 1,000-hour incandescent, use of 3 hrs/day, 11.09¢/kWh electric rate, $3.00 CFL and $0.50 Incandescent.
  19. Environmental Impact A single 20-watt CFL used in place of a 75-watt incandescent will save about 550 kilowatt-hours over its lifetime. That savings represents nearly 500 pounds of coal not burned, which means 1,300 lbs. of carbon dioxide & 20 lbs. of sulfur dioxide are not released
  20. Light Bulbs and the Law Voluntary Action Public education on CFLs Incentives Subsidies and/or give-aways Legislation Some counties have banned incandescents U.S., Australia and Canada set efficiency standards The Energy Independence and Security Act of 2007 (“The Energy Bill”)
  21. The Energy Bill All bulbs must use 30% less energy than today’s incandescent bulbs by 2012-2014 2012 Phase out 100W bulbs 2014 End with 40W bulbs 2020 All must be 70% more efficient (= to today’s CFLs) Lighting ~ 20% average household’s energy bill This bill could cut nation’s electric bill by more than $10 billion a year Many types of incandescent bulbs are exempt
  22. How To Choose? Determine where and use Shape Size Base Color Lumens Watts Type Label – Energy Star
  23. Energy Star Web Guidehttp://www.drmediaserver.com/CFLGuide/index.html
  24. Tips for How to Choose Read the Package Hold the base, not the glass to screw in the bulb Use CFLs in places where you will have the light on for at least 15 minutes at a time Most photocells and timers do not work with CFLs Recycle CFLs Follow guide-lines to clean up a broken CFL
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