This dimmer light feels cozier and is more likely to be used in restaurants and bedrooms for general ambient lighting. Lights under 3,000K give off warm (yellowish) light that’s often called “soft white” in the bulb’s description. The Kelvin scale runs from 1,000 to 10,000. Color TemperatureĬolor temperature, measured in Kelvins, indicates the warmness or coolness of the light. The more lumens per watt the bulb offers, the more energy efficient it is. Check the watts versus lumens to get a better idea of the bulb’s energy efficiency. Some types of bulbs are more efficient than others, which can make choosing a bulb for energy efficiency a bit confusing. For example, both a 4-watt LED light bulb and a 25-watt incandescent bulb emit 220 lumens however, an 18-watt halogen bulb also gives off around 220 lumens. However, halogen, CFL, and LED lights use fewer watts but emit an equal amount of lumens. A 40-watt incandescent bulb typically gives off 400 lumens of light. Brightness, measured in lumens, is a measure of how much light the bulb emits. Watts indicates how much electricity a light bulb uses. The bulbs reach full brightness right away, and they’re dimmable. They’re also usually smaller than incandescent bulbs. The result is a bright light that uses less energy. The quartz resists heat better than glass, and the halogen gas inside the bulb is more efficient than that in an incandescent bulb. They contain a tungsten filament encased in quartz filled with halogen gas. Halogen: Halogen bulbs use about 25-percent less energy than an incandescent bulb, and they show true colors better than other energy-efficient options.CFLs must be disposed of properly because they contain mercury, which isn’t dangerous when the bulbs are in use and intact. CFLs don’t usually work with dimmers, timers, or motion sensors, and they sometimes distort colors. That’s particularly noticeable outdoors, where cold temperatures can extend warming time. CFLs take a few minutes to warm up to reach full brightness. CFLs use from 50- to 80-percent less energy than an incandescent bulb, yet they offer equally bright light.
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