Energy Efficient Light Bulbs 101 - At Home

Confused by which light bulb to buy? We’ve put together a short primer to (ahem!) “shine some light” on the topic for you.

Here’s the key thing to know about light bulbs. If you buy junk, you’ll get junk. 

Quick facts:

  • It used to be that wattage of the bulb determined what you needed to buy. Not so much anymore. Lumens is what you should look for. The higher the lumens, the more light is output by the bulb.
  • Be wary of really cheap LEDs. More than likely they don’t last very long. LEDs are supposed to last well around 20 years. Cheap ones typically last for less than 10 years.
  • Only buy bulbs with an ENERGY STAR logo on them. This is the only way to know if a light bulb is truly a good purchase. In order to receive the ENERGY STAR logo, they can’t just save energy. They must be in the top 25% of its class, pay for itself, AND be independently verified. This is why cheap LEDs, which save energy, cannot get the ENERGY STAR logo.

So let’s get started!

Incandescent Bulbs:  These are what I call the “old-fashioned” bulbs though they are becoming less standard all the time.


Pros: They create warm light. Designers love this bulb best.

Cons: They wear out quickly, use more energy, and create more heat. That means more frequent replacement and more energy use.

Life: 800 – 1,000 hours

Cost per bulb: ~ $1 per bulb

Dimmable: Yes

Energy used: ~.06 Kilowatts (kW)

CFL-light-bulb

www.lightingandmaintenancesolutions.com


 

CFL (Compact Fluorescent Lights) Bulbs: The second generation to the humming tubes hanging in your dad’s basement workshop, these are the curly-shaped little darlings.

When we first moved away from incandescent bulbs, critics of the CFL cried ugly because they produced a cool, harsh, light with blue undertones. As technology has advanced, CFLs can be found in warmer color spectrums that are closer to the traditional incandescents.

Pros: CFLs use 75% less energy than incandescent bulbs.

Cons: CFLs contain mercury.

Life: 6,000 – 15,000 hours

Cost per bulb: ~ $2 per bulb

Dimmable: No (dimmable options may be available for purchase)

Energy Used: ~.014 Kilowatts (kW)


LED (Light Emitting Diode): The energy superstars of the group. Depending on the brand and variety, they can last from 2 – 25 years. Put them in your teenagers’ bedrooms. You know they’re not switching them off.

Pros: LED bulbs produce less heat and last a long time. New LED bulbs can cast that warm-colored light we love. LEDs don’t break when jostled, a huge factor in busy manufacturing sites and industrial areas. Best of all, they don’t contain mercury.

Cons: LED technology is moving quickly.  Some of these bulbs still create directional light, but most newer versions disperse light better.  Lastly, LEDs do have a slightly higher upfront cost.

Life: 50,000 hours

Cost per bulb: ~$1.25 – ~$20

Dimmable: Yes (non dimmable options are available)

Energy used: ~.008 Kilowatts (kW)

Sustainable Efforts for Light Bulbs:

  • Place your lights on a dimmer. It can save up to 50% in energy costs. Remember, most CFLs and even most LEDs aren’t dimmable. You’ll need to specifically buy dimmable bulbs!
  • Turn out the lights: One incandescent bulb left on 8 hours costs ~ 6 cents. 5 incandescents burning 8 hours cost ~ 30 cents which equates to $110/year. A possible overnight scenario might include 2 porch lights, 1 kitchen light, 1 family room light, and 1 bathroom light burning. Good old Dad was right after all.
  • Recycle:  CFLs contain mercury and all bulbs take up space in landfills. The good news is it’s easy to recycle your old bulbs. You can even bring them to your neighborhood hardware stores. Visit this site http://search.earth911.com/ and type in your zip code for recyclers near you

 

Comparison Between LED, CFL and Incandescent Light Bulbs:

LEDCFLIncandescent
Lifespan in hours50,0009,0001,000
Watts (equivalent 60 watts)81460
Cost per bulb$2$2$1
Daily cost*$0.004$0.007$0.03
Annual cost*$1.46$2.56$10.95
Cost for 50k hours @ $0.10 kWh$39.58$70.83$300
Bulbs needed for 50k hours15.550
Total cost for 50k hours with bulb price$41.58$81.83$350.00

Source: http://energyusecalculator.com/electricity_cfllightbulb.htm

Conclusion:

  • Try to buy LEDs everywhere you can, but if you can’t, target your high use areas first! If you have incandescents, go ahead and replace them. If you have CFLs, wait until they die, and then upgrade.
  • LEDs have gotten extremely cheap! Off brand is perfectly fine to buy, as long as they have the ENERGY STAR logo.
  • Make sure to match lumens, not watts. Take your old bulbs with you to the store and look for the LEDs that have close to the same lumens, not watts. You may have a 60 watt incandescent only to find a 40 watt ‘equivalent’ LED is actually what you need.

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