Home / Style Guide / Learn About LED / LED Bulb Tips and Information 4 Things to know when selecting LED Bulbs or Fixtures If you replace the bulbs in your current fixtures with LED bulbs, chances are you’ll notice an immediate difference in your energy usage (and bills!). Selecting an LED bulb is a little different than buying an incandescent or CFL. Here are few items we recommend you look for when choosing your LEDs. Since all of this information is required to appear on a bulb’s box, it makes selection a little easier: 1. Color Temperature Measured in Kelvin on a scale of 1,000-10,000, color temperature describes the appearance of the illumination provided by a bulb. The lower the Kelvin number, the more orange/red/yellow the light. Matching the color of light to the surroundings will create harmony for the eyes and make the space look and feel comfortable and “right.” 2700-2900 Kelvin produces a warm, calm, inviting and intimate color of light. It is generally the color of incandescent lighting. Choose a 2700 Kelvin bulb if the environment includes brown woods, golds, reds, or orange colors (paint, rugs, furnishings). 3000-4900 Kelvin is a cool and vibrant color of illumination. It’s preferred for garages, task lighting, basements and sometimes for bathrooms because of its closeness to morning light. Choose 3000 Kelvin for environments utilizing a lot of blues, greens, blacks and whites, or other cool colors. Greater than 4900 Kelvin is considered sunlight at high noon. It has a stark white or bluish appearance. This invigorating and keen light color should be used for security lighting and displaying artwork. Color Temp 2700º For a warm-yellow light, use bulbs marked 2700-2900K. Color Temp 3000º For a whiter light, use bulbs marked 3000-4900K. Color Temp 5000º For cool-blue light, use bulbs marked 5000-6500K. 2. CRI (Color Rendering Index) CRI is measured on a 0-100 scale. The measurement defines the ability of the light source to reveal the true colors of the items it illuminates compared to natural light. Always look for a bulb with a CRI of 85 or better. 3. Lumens Converting the old standards of watts (which is a measure of energy) to lumens (a measure of light output) only sounds intimidating. A general rule of thumb is a 60W incandescent bulb emitted about 800 lumens. The lumen output of LED appears on the box, and is sometimes also referred to as brightness. 4. Dimmability Unlike incandescent, not all LED bulbs or fixtures dim. Utilizing a non-dimming LED with a dimmer will cause light flicker and noise. For most applications, choose bulbs that dim.