The Energy Star rating is given to light bulbs that have achieved a very high level of operational efficiency. Energy Star rated bulbs will have a blue Energy Star insignia on the packaging, so they can easily be identified by just looking at the outside of the package. These highly efficient light bulbs will save 75% on energy consumption versus a traditional bulb of the same wattage. Energy Star rated light bulbs are typically more expensive than traditional bulbs, so you will have to balance the increased purchase price versus the savings in electricity over the life of the light bulb. If the difference in cost is of little concern and efficiency is your motivating factor, then this type of bulb is for you. Read more.