Measurement of the brightness (light output) of the light bulb. The higher the lumens, the brighter the light bulb. You will want to look for lumens now vs. watts when shopping for briteness of light bulbs.
Estimated Yearly Energy Cost
Based on three hours of use per day at the average U.S. electricity price of 11 cents per kilowatt hour. This cost may vary based on local electricity rates and how long your lights are on.
How long your light bulb is expected to last based on being turned on for three hours per day.
The light bulb’s color temperature and is measured on a Kelvin (k) scale ranging from 2700k - 6500k. Light bulbs with a color temperature in the warm range (2900 - 3000k) will have a softer yellowish light. Light bulbs that are labeled cool white and have 4100k temperature have whiter light whereas light bulbs with 5000k to 650k are meant to mimic natural daylight.
Measurement in wattage of the light bulb. The 200 EISA Legislation requires that new light bulbs use 25% less energy than traditional incandescent light bulbs. Many of the new energy saving LED, CFL and halogen light bulbs consume less energy.
The ENERGY STAR logo on the label means that the U.S. government has recognized this product as providing significant energy savings without sacrificing performance. It also highlights that while the product might cost more up-front, customers will recoup this additional investment through long-term energy savings.