Equivalent Incandescent Wattage
57
Color of Light
Warm White/Soft White
Light Output (lumens)
900
Color Temperature (kelvin)
2700
Annual Energy Consumption (kWh)
15
Equivalent Incandescent Annual Energy Consumption (kWh)
62
Equivalent Incandescent Annual Energy Cost
$7
Equivalent Incandescent Bulb Life (hours)
750
Equivalent Incandescent Bulb Life (years)
0.7
Energy Star Qualified
Yes
Light Bulb Buying Guide
A quick guide to strategic product selection
Lighting typically accounts for 20% of residential electricity use. This means significant cost savings can be achieved with lighting improvements.
Eco-rate currently recommends compact fluorescent light bulbs (CFLs) as the most energy-efficient and cost-effective option for residential lighting on the market today. Click here to view our Lighting Technologies page. CFLs use 75% less energy and last 10 times longer than traditional incandescent light bulbs. However, CFLs do contain mercury, a chemical element with compounds that are extremely toxic to humans and the natural environment. Their use and disposal should be done with caution (see below for responsible disposal tips).
Another drawback to CFLs is that they cannot be produced locally here in the United States. Current U.S. EPA regulations prevent CFLs from being manufactured in the U.S. because of their high mercury levels. Hence, all CFLs are manufactured overseas, with 95% of them coming from China.
We recommend selecting a light bulb on Eco-rate with the highest “Average Eco-rating”. This is the product that scores best in terms of environmental impact and price. Amongst other factors, this product emits the most amount of light using the least amount of energy at the best price. Click here to discover how we rate light bulbs.
Wattage equivalence
Look for the incandescent wattage equivalence of the CFL. This will ensure you are getting the same amount of light when replacing an incandescent bulb with a CFL. CFLs use 75% less energy than incandescents but emit the same amount of light (e.g. a 9-watt CFL bulb can produce as much light as a 37-watt incandescent bulb).
► When replacing incandescent light bulbs with ENERGY STAR CFLs, simply refine your CFL product search on Eco-rate by selecting “Equivalent Incandescent Wattage” on the product results page. Click here get started.
Efficiency
Bulb efficiency is measured by the amount of light - or "lumens" - produced per watt of electricity consumed (lumens per watt). The higher number of lumens per watt a light bulb can produce, the more efficient it is. CFLs are more efficient than incandescent bulbs because they use less electricity - or wattage - to produce the same amount of light.
► Each CFL bulb featured on Eco-rate includes lumens per watt information. Our Consumption Ratings for light bulbs factor-in lumens per watt. The higher the Consumption Rating, the more lumens per watt the bulb emits and the more efficient it is.
Longevity
Purchase light bulbs with high life hour ratings. Some bulbs on the market today last up to 15,000 life hours, the equivalent of 13.7 years. This is a significant difference when compared to standard incandescent light bulbs, which have typical a life of 750 hours, or less than one year.
► Each CFL bulb featured on Eco-rate has an extended life when compared to its incadescent counterpart. Each CFL's stated life hours is factored into our ratings and is viewable under the each product's Specifications tab.
Color
CFLs are available in a variety of shades, ranging from warm yellow to bright white light. Light color is measured on a temperature scale referred to as degree Kelvin (K). Lower Kelvin numbers mean the light appears more yellow; higher Kelvin numbers mean the light appears whiter. If you want to replace your CFLs with warm white/soft white light to match that of incandescent bulbs, choose CFLS with 2700-3000K temperature ratings.
Color Temperature
- Soft yellow: 2300-2700K
- Warm white/soft white: 2700-3000K
- Cool white/bright white: 3100-4100K
- Natural/daylight: 4500-6500K
► Each CFL bulb featured on Eco-rate includes color temperature and color of light information. Click on a product's Specifications tab to view this information.
Color Rendering Index (CRI)
Another important component of a light bulb is its Color Rendering Index (CRI), or the ability of the bulb to show colors comparable to that of an incandescent. ENERGY STAR requires a CRI of at least 80 for qualified CFLs (incandescent light bulbs have a CRI of 100).
The current challenge for you as the consumer is the fact that manufacturers are not required to list the CRI. When consumers purchase a CFL with an unappealing color, they often digress to the old incandescent technology for familiarities sake. Please resist this urge; find the right CFL for your color preference using Eco-rate, and give it two weeks, in such time your eye will adjust and you won’t even notice a difference (the only difference being your lower electric bills!). If CRI is not listed, rely on degree Kelvin for your color choice (see above).
Toxicity
As noted above, CFLs contain on average 4 milligrams of mercury sealed within the glass tubing. By comparison, older thermometers contain approximately 500 milligrams of mercury. Mercury is an element (Hg on the periodic table) found naturally in the environment, however it is highly toxic to human health and the natural environment.
► Mercury toxicity of CFLs is reflected in the Toxicity Rating of each CFL bulb featured on Eco-rate.
Disposal
As stated above, CFLs contain mercury, a chemical element with compounds that are extremely toxic, and need to be disposed of properly - not thrown in your wastebasket! You can use Eco-rate’s product search tool to find a new light bulb and then select the “Recycle” tab from the product page. You will then be able to use the Earth 911 search widget to find a local location where your old bulbs can be disposed of responsibly.
Your local utility company will also be able to help you know where and how to responsibly dispose of your old bulbs.
How to maximize the performance of your CFLs
- Use natural daylight from windows and skylights whenever possible.
- Keep your lamps and fixtures clean. Dirt reduces visible light output, which leads to switching on additional lights and/or unnecessary bulb replacement.
- Avoid having too many lights controlled by a single switch - this can result in having lights on where and when you don't need them.
- Light-colored walls and ceilings reflect about 80% of light that strikes them, and dark-colored surfaces reflect only about 10% of the light. So when you are re-decorating, remember that you will need brighter lights in a room with a dark decor than in a room with light surfaces.
- Place floor lamps or table lamps in a corner instead of in the middle of a wall. This will allow light to reflect off two walls, giving you more usable light for your money.
How are light bulbs rated on Eco-rate?
Please click here to discover our light bulb rating system.
Questions? Feedback?
Visit our Forum to ask questions and share your thoughts about energy-efficient lighting technologies.
This product meets the LEED for Homes EA 8.1: Lighting, Energy Star Lights prerequisite and is eligible for 0.5 points under the LEED for Homes EA 8.2: Lighting, Improved Lighting credit (must be installed in high-use rooms).
For more information on LEED product compliance, contact Eco-rate's LEED Accredited Professional:
Brycelaine Self, MS, LEED AP
E-mail: bself@eco-innovations.com
Phone: 206.708.7464